🕷️ Crawler Inspector

URL Lookup

Direct Parameter Lookup

Raw Queries and Responses

1. Shard Calculation

Query:

Response:

Calculated Shard: 94 (from laksa126)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa094.int.ahrefs:8124/' \
  -H 'Content-Type: text/plain' \
  -H 'X-ClickHouse-Database: crawler3' \
  -H 'Authorization: Basic YXBpOg==' \
  -d 'SELECT getAhrefsURLFromUnparsed(src_unparsed) AS found_url, ifNull(toUnixTimestamp(download_stamp), 0) AS crawl_time, ifNull(toUnixTimestamp(props_url_first_seen), 0) AS first_indexed_time, download_http_code AS http_code, src_unparsed AS src_unparsed, src_root_hash AS src_root_hash, history_drop_reason AS history_drop_reason, meta_title AS meta_title, meta_descriptions AS meta_descriptions, attrs_boilerpipe_text AS attrs_boilerpipe_text, attrs_markdown AS attrs_markdown, attrs_readable_markdown AS attrs_readable_markdown, meta_canonical AS meta_canonical FROM crawler3.page_info_local FINAL PREWHERE (src_root_hash, src_unparsed) IN ((getAhrefsRootHashFromUnparsed(getAhrefsUnparsedNoserviceFromURL(\'https://agsci.psu.edu/smellcheck\')), getAhrefsUnparsedNoserviceFromURL(\'https://agsci.psu.edu/smellcheck\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/agsci.psu.edu\/smellcheck","crawl_time":1775330831,"first_indexed_time":1599360865,"http_code":200,"src_unparsed":"edu,psu!agsci,\/smellcheck s443","src_root_hash":"16520191723648810894","history_drop_reason":null,"meta_title":"COVID-19 Smell Check — Penn State College of Agricultural Sciences","meta_descriptions":["Sudden loss of the sense of smell, anosmia, is one of the earliest signs and best predictors of COVID-19. Put your nose to work to keep yourself and others healthy. Perform daily smell checks to catch COVID-19 in its tracks and prevent its spread."],"attrs_boilerpipe_text":"Your nose knows\nSudden loss of the sense of smell is one of the earliest signs and best predictors of COVID-19. Put your nose to work to keep yourself and others healthy. Perform daily smell checks to catch COVID-19 in its tracks and prevent its spread.\nHow Ag Sciences is fighting COVID\nFood Science might not be the first discipline that comes to mind in the battle against COVID-19. But in the spring of 2020, anecdotes of anosmia (the inability to smell) associated with coronavirus infection began to appear. More and more patients reported experiencing a sudden inability to smell. Researchers in the Penn State Department of Food Science were unexpectedly but uniquely prepared to investigate the connection. They quickly emerged as leaders in global research on COVID-19 and sudden smell loss.\nPivoting to meet a new challenge\nBefore the COVID-19 pandemic, Penn State food scientists\nDr. John Hayes\nand\nDr. Alyssa Bakke\nused their expertise in taste biology, psychology, flavor perception, and other disciplines to better understand the human sensory experience. Their work in the\nPenn State Sensory Evaluation Center\nisn't focused only on controlled taste tests to quantify and optimize consumer products. They and fellow researchers also study human smell and taste perception directly to better understand how people differ in their sensory experiences.\nThe research team saw that they could redirect their expertise to COVID-19.\nWorking with over 600 clinicians, scientists, and patient advocates in more than 40 countries, Penn State researchers developed, distributed, and analyzed data from surveys that expanded and solidified our understanding of the virus’s link to anosmia (the inability to smell) and hyposmia (reduced ability to smell). More than 25,000 participants responded to a survey on behalf of the Global Consortium for Chemosensory Research. The results determined that 50 to 75 percent of those infected with COVID-19 experienced smell and\/or taste disturbances, establishing smell loss as a more accurate predictor of infection than cough or fever.\nAs research continues, scientists are optimistic that smell checks will become an effective public health tool that can be used to predict COVID-19 infection and mitigate its spread.\nWhat you need to do\nTest your smell each day.\nYou can use your morning coffee, food, flowers, spices, perfume—you name it. Stop and take careful notice of whether or not you can smell.\nBe safe when you check.\nPerform your sniff test alone with your mask off—and be sure to mask back up!\nEven if you can smell, don’t throw caution to the wind. Always practice preventive behavior like social distancing, mask use, and frequent handwashing.\nMake it a habit.\nMark your calendar. Set an alarm. Make a daily smell check as routine as washing your face or brushing your teeth.\nActively and intentionally pay attention to your sense of smell each day.\nIf you can’t smell familiar scents, take action.\n Self-isolate until you speak with a healthcare professional:\nStudents at University Park:\nContact\nUniversity Health Services.\nStudents at other Penn State campuses:\nContact your\ncampus health center.\nPenn State personnel:\nContact\nPenn State Occupational Medicine\nat\npsuoccmed@psu.edu\nor 814-863-8492.\nThe science behind it all\nIt's not just there to hold up your sunglasses—your nose is a sophisticated piece of diagnostic equipment\nAnosmia is the inability to smell, and can occur with viral illness or head trauma. Sudden and unexplained loss of the sense of smell has emerged as a critical diagnostic marker of COVID-19.\nHow It Works\nCOVID-19’s first stop in the human body are support cells in the top of the nasal cavity. These cells express lots of the ACE2 receptor that the virus uses to sneak into cells. When these cells are attacked, we can’t smell because of local inflammation that disrupts our smell receptors, the link between odors and our brain.\nAs many as 75 percent of those infected with COVID report smell loss. Anosmia is one of the earliest  signs and accurate predictors of COVID-19. In fact, it’s a better diagnostic symptom than fever and cough. That’s even more true with those who don’t otherwise feel unwell. Unlike other viruses, many people with COVID-19 can experience smell loss without a runny nose or any congestion.  \nRemember—Anosmia is just one symptom of COVID-19.\nEven if your sense of smell is working, you may not be in the clear. Also monitor yourself for all of the symptoms indicated by the\nCenters for Disease Control and Prevention\n. If you exhibit symptoms or have been in contact with someone who has, self-isolate and contact University Health Services, your campus health center, or your primary care provider.\nCOVID-19 symptoms to watch for:\nFever or chills\nCough\nShortness of breath or difficulty breathing\nFatigue\nMuscle or body aches\nHeadache\nNew loss of taste or smell\nSore throat\nCongestion or runny nose\nNausea or vomiting\nDiarrhea\nResources\nPenn State COVID-19 Tools and Information\nPenn State Go App\n: Download for symptom checker, FAQs, and more\nBack to State\n: Keeping the University safe\nCoronavirus Information\n: Updates for the Penn State community\nCampus Health Services\n: Details on campus resources at across the state\nUniversity Health Services\n: Comprehensive health care resources at University Park\nPenn State Occupational Medicine\n: Full-service occupational and environmental medicine practice serving Penn State employees\nIn the News: COVID-19 and Sense of Smell\nCan you smell your coffee? If not, you should get tested for COVID-19\n(Fast Company, December 11, 2020)\nSmell and taste changes are early indicators of the COVID-19 pandemic and political decision effectiveness\n(Nature Communications, October 14, 2020)\nPenn State sensory scientists encourage smell checks to fight COVID-19 spread\n(Penn State News, October 8, 2020)\nWhy Is It So Hard to Study Covid-Related Smell Loss?\n(WIRED, September 25, 2020)\nWhat It’s Like to Lose Your Sense of Taste and Smell from Covid-19\n(The Healthy, September 15, 2020)\nWhy COVID-19 Makes People Lose Their Sense of Smell\n(Scientific American, June 13, 2020)\nCOVID-19, smell and taste - how is COVID-19 different from other respiratory diseases?\n(The Conversation, June 4, 2020)\nGlobal survey shows link between COVID-19 patients and taste, smell loss\n(The Times of Israel, May 11, 2020)\nPotential link between COVID-19 and loss of smell, taste to be explored\n(Penn State News, April 1, 2020)\nThe\nPenn State Sensory Evaluation Center\nin the College of Agricultural Sciences is a hub of efforts to understand the link between anosmia and COVID-19. We’re hard at work with researchers, clinicians, and patients around the world. Together, we will nose out new ways to keep our community safe.","attrs_markdown":"[Skip to main content](https:\/\/agsci.psu.edu\/smellcheck#main)\n\n*Toggle navigation*\n\n[![Penn State College of Agricultural Science Logo](https:\/\/assets.agsci.psu.edu\/++resource++agsci.common\/assets\/images\/psu-agr-logo-rev-single.png)](https:\/\/agsci.psu.edu\/)\n\n- [Students](https:\/\/agsci.psu.edu\/students)\n  - [Undergraduate Students](https:\/\/agsci.psu.edu\/students\/undergraduate)\n  - [Graduate Students](https:\/\/agsci.psu.edu\/students\/graduate)\n  - [All Information for Students](https:\/\/agsci.psu.edu\/students)\n- [Industry](https:\/\/agsci.psu.edu\/industry)\n  - [Penn State Ag Council](https:\/\/agsci.psu.edu\/industry\/agcouncil)\n  - [Ag Action Network](https:\/\/agsci.psu.edu\/industry\/ag-action-network)\n  - [CARET](https:\/\/agsci.psu.edu\/industry\/caret)\n  - [Recruitment and Employer Relations](https:\/\/agsci.psu.edu\/students\/careers\/information-for-employers)\n  - [Continuing Education](https:\/\/agsci.psu.edu\/industry\/continuing-education)\n  - [Labs and Services](https:\/\/agsci.psu.edu\/industry\/services)\n  - [All Information for Industry](https:\/\/agsci.psu.edu\/industry)\n- [Alumni](https:\/\/agsci.psu.edu\/alumni)\n  - [Get Involved](https:\/\/agsci.psu.edu\/alumni\/membership)\n  - [Awards and Recognition](https:\/\/agsci.psu.edu\/alumni\/awards)\n  - [Armsby Honor Society](https:\/\/agsci.psu.edu\/alumni\/armsby)\n  - [All Information for Alumni](https:\/\/agsci.psu.edu\/alumni)\n- [Faculty & Staff](https:\/\/agsci.psu.edu\/faculty-staff)\n  - [Faculty & Staff Resources](https:\/\/agsci.psu.edu\/faculty-staff)\n  - [All Information for Faculty & Staff](https:\/\/agsci.psu.edu\/faculty-staff)\n- [Visitors & Public](https:\/\/agsci.psu.edu\/visitors-and-public)\n  - [Places to Visit](https:\/\/agsci.psu.edu\/visitors-and-public\/places-to-visit)\n  - [Service Laboratories](https:\/\/agsci.psu.edu\/visitors-and-public\/service-laboratories)\n  - [Programs and Events](https:\/\/agsci.psu.edu\/visitors-and-public\/programs-and-events)\n  - [Youth Opportunities](https:\/\/agsci.psu.edu\/visitors-and-public\/youth-opportunities)\n  - [All Information for Visitors & Public](https:\/\/agsci.psu.edu\/visitors-and-public)\n\n- [Academics](https:\/\/agsci.psu.edu\/academics)\n  [Academics Overview](https:\/\/agsci.psu.edu\/academics)\n  \n  [![](https:\/\/assets.agsci.psu.edu\/++resource++agsci.common\/assets\/images\/card-placeholder.jpg) Compare our 17 diverse majors and find the best fit for you\\!](https:\/\/agsci.psu.edu\/academics\/undergraduate\/degree-explorer)\n  \n  - [Academics Overview](https:\/\/agsci.psu.edu\/academics)\n  \n  - [Undergraduate Degrees](https:\/\/agsci.psu.edu\/academics\/undergraduate)\n  - [Majors](https:\/\/agsci.psu.edu\/academics\/undergraduate\/majors)\n  - [Minors](https:\/\/agsci.psu.edu\/academics\/undergraduate\/minors)\n  - [Associate Degrees](https:\/\/agsci.psu.edu\/academics\/undergraduate\/associate-degrees)\n  - [Certificates](https:\/\/agsci.psu.edu\/academics\/undergraduate\/certificates)\n  - [Online Degrees](https:\/\/agsci.psu.edu\/academics\/undergraduate\/online-degrees)\n  - [Study Abroad](https:\/\/agsci.psu.edu\/global\/study-abroad)\n  \n  - [Graduate Degree Programs](https:\/\/agsci.psu.edu\/academics\/graduate)\n  - [Our Graduate Degree Programs](https:\/\/agsci.psu.edu\/academics\/graduate\/programs)\n  - [Intercollege Degree Programs](https:\/\/agsci.psu.edu\/academics\/graduate\/intercollege-degree-programs)\n  - [Dual-Title Degree Programs](https:\/\/agsci.psu.edu\/academics\/graduate\/dual-title-degree-programs)\n  - [Online Degree Programs](https:\/\/agsci.psu.edu\/academics\/graduate\/online-degree-programs)\n  \n  - [Ag Sciences Global](https:\/\/agsci.psu.edu\/global)\n  \n  - [Academic Departments](https:\/\/agsci.psu.edu\/academics\/departments)\n  \n  - [Student Resources](https:\/\/agsci.psu.edu\/students)\n  \n  [Request Information](https:\/\/agsci.psu.edu\/admissions\/undergraduate\/request)\n  \n  [Schedule a Visit](https:\/\/agsci.psu.edu\/admissions\/undergraduate\/visit)\n  \n  [Application Procedures](https:\/\/admissions.psu.edu\/apply\/)\n  \n  [Compare our Undergraduate Degrees](https:\/\/agsci.psu.edu\/academics\/undergraduate\/degree-explorer)\n- [Admissions](https:\/\/agsci.psu.edu\/admissions)\n  [Admissions Overview](https:\/\/agsci.psu.edu\/admissions)\n  \n  [![](https:\/\/assets.agsci.psu.edu\/++resource++agsci.common\/assets\/images\/card-placeholder.jpg) Interested in pursuing undergraduate education at Penn State? 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Ask Tilva™, Penn State Extension's AI Assistant\\!](https:\/\/ai.extension.psu.edu\/?utm_campaign=GEXP__AW__TILVA&utm_source=AGSCI&utm_medium=WEBSITE)\n  \n  - [Extension Overview](https:\/\/agsci.psu.edu\/extension)\n  \n  - As part of a top research institution, Penn State Extension delivers science-based information to citizens. 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Smell. Be well.\n## COVID-19 Smell Check\nYour nose knows\n\nSudden loss of the sense of smell is one of the earliest signs and best predictors of COVID-19. Put your nose to work to keep yourself and others healthy. Perform daily smell checks to catch COVID-19 in its tracks and prevent its spread.\n\n## How Ag Sciences is fighting COVID\nFood Science might not be the first discipline that comes to mind in the battle against COVID-19. But in the spring of 2020, anecdotes of anosmia (the inability to smell) associated with coronavirus infection began to appear. More and more patients reported experiencing a sudden inability to smell. Researchers in the Penn State Department of Food Science were unexpectedly but uniquely prepared to investigate the connection. They quickly emerged as leaders in global research on COVID-19 and sudden smell loss.\n\nLearn More\n\n![](https:\/\/agsci.psu.edu\/smellcheck\/front-page\/@@agsci.common.tiles.dropdown_accordion\/b0f03b2b7542406dbe0be33908bb2833\/@@images\/image_0-0-d66ac12c67851b391ad46baec2f0e69d.jpeg)\n\n### Pivoting to meet a new challenge\nBefore the COVID-19 pandemic, Penn State food scientists [Dr. John Hayes](https:\/\/foodscience.psu.edu\/directory\/jeh40) and [Dr. Alyssa Bakke](https:\/\/foodscience.psu.edu\/directory\/abc18) used their expertise in taste biology, psychology, flavor perception, and other disciplines to better understand the human sensory experience. Their work in the [Penn State Sensory Evaluation Center](https:\/\/foodscience.psu.edu\/about\/facilities\/sensory) isn't focused only on controlled taste tests to quantify and optimize consumer products. They and fellow researchers also study human smell and taste perception directly to better understand how people differ in their sensory experiences.\n\nThe research team saw that they could redirect their expertise to COVID-19.\n\nWorking with over 600 clinicians, scientists, and patient advocates in more than 40 countries, Penn State researchers developed, distributed, and analyzed data from surveys that expanded and solidified our understanding of the virus’s link to anosmia (the inability to smell) and hyposmia (reduced ability to smell). More than 25,000 participants responded to a survey on behalf of the Global Consortium for Chemosensory Research. The results determined that 50 to 75 percent of those infected with COVID-19 experienced smell and\/or taste disturbances, establishing smell loss as a more accurate predictor of infection than cough or fever.\n\nAs research continues, scientists are optimistic that smell checks will become an effective public health tool that can be used to predict COVID-19 infection and mitigate its spread.\n\n## What you need to do\n![Stop Smell Be Well](https:\/\/agsci.psu.edu\/smellcheck\/images\/stopsmellbewell.png\/@@images\/image-800-decc32a4d7b0c34dd09b78e8b446d431.png)\n\n### Test your smell each day.\nYou can use your morning coffee, food, flowers, spices, perfume—you name it. Stop and take careful notice of whether or not you can smell.\n\nBe safe when you check.\n\n- Perform your sniff test alone with your mask off—and be sure to mask back up\\!\n- Even if you can smell, don’t throw caution to the wind. Always practice preventive behavior like social distancing, mask use, and frequent handwashing.\n\nMake it a habit.\n\n- Mark your calendar. Set an alarm. Make a daily smell check as routine as washing your face or brushing your teeth.\n- Actively and intentionally pay attention to your sense of smell each day.\n### If you can’t smell familiar scents, take action.\nSelf-isolate until you speak with a healthcare professional:\n\n- *Students at University Park:* Contact [University Health Services.](https:\/\/studentaffairs.psu.edu\/health)\n- *Students at other Penn State campuses:* Contact your [campus health center.](https:\/\/studentaffairs.psu.edu\/health-wellness\/medical-services\/health-services-commonwealth-campuses)\n- *Penn State personnel:* Contact [Penn State Occupational Medicine](https:\/\/hr.psu.edu\/occupational-medicine) at [psuoccmed@psu.edu](mailto:psuoccmed@psu.edu) or 814-863-8492.\n\n## The science behind it all\nIt's not just there to hold up your sunglasses—your nose is a sophisticated piece of diagnostic equipment\n\nAnosmia is the inability to smell, and can occur with viral illness or head trauma. Sudden and unexplained loss of the sense of smell has emerged as a critical diagnostic marker of COVID-19.\n\n### How It Works\nCOVID-19’s first stop in the human body are support cells in the top of the nasal cavity. These cells express lots of the ACE2 receptor that the virus uses to sneak into cells. When these cells are attacked, we can’t smell because of local inflammation that disrupts our smell receptors, the link between odors and our brain.\n\nAs many as 75 percent of those infected with COVID report smell loss. Anosmia is one of the earliest signs and accurate predictors of COVID-19. In fact, it’s a better diagnostic symptom than fever and cough. That’s even more true with those who don’t otherwise feel unwell. Unlike other viruses, many people with COVID-19 can experience smell loss without a runny nose or any congestion.\n\n### Remember—Anosmia is just one symptom of COVID-19.\nEven if your sense of smell is working, you may not be in the clear. Also monitor yourself for all of the symptoms indicated by the [Centers for Disease Control and Prevention](https:\/\/www.cdc.gov\/coronavirus\/2019-ncov\/index.html). If you exhibit symptoms or have been in contact with someone who has, self-isolate and contact University Health Services, your campus health center, or your primary care provider.\n\nCOVID-19 symptoms to watch for:\n\n- Fever or chills\n- Cough\n- Shortness of breath or difficulty breathing\n- Fatigue\n- Muscle or body aches\n- Headache\n- New loss of taste or smell\n- Sore throat\n- Congestion or runny nose\n- Nausea or vomiting\n- Diarrhea\n\n## Resources\n### Penn State COVID-19 Tools and Information\n- [Penn State Go App](https:\/\/mobile.psu.edu\/): Download for symptom checker, FAQs, and more\n- [Back to State](https:\/\/virusinfo.psu.edu\/back-to-state): Keeping the University safe\n- [Coronavirus Information](https:\/\/virusinfo.psu.edu\/): Updates for the Penn State community\n- [Campus Health Services](https:\/\/studentaffairs.psu.edu\/health-wellness\/medical-services\/health-services-commonwealth-campuses): Details on campus resources at across the state\n- [University Health Services](https:\/\/studentaffairs.psu.edu\/health): Comprehensive health care resources at University Park\n- [Penn State Occupational Medicine](https:\/\/hr.psu.edu\/occupational-medicine): Full-service occupational and environmental medicine practice serving Penn State employees\n### In the News: COVID-19 and Sense of Smell\n- [Can you smell your coffee? If not, you should get tested for COVID-19](https:\/\/www.fastcompany.com\/90585051\/sniff-check-covid-19-early-detection) (Fast Company, December 11, 2020)\n- [Smell and taste changes are early indicators of the COVID-19 pandemic and political decision effectiveness](https:\/\/www.nature.com\/articles\/s41467-020-18963-y) (Nature Communications, October 14, 2020)\n- [Penn State sensory scientists encourage smell checks to fight COVID-19 spread](https:\/\/news.psu.edu\/story\/634903\/2020\/10\/08\/research\/penn-state-sensory-scientists-encourage-smell-checks-fight-covid-19) (Penn State News, October 8, 2020)\n- [Why Is It So Hard to Study Covid-Related Smell Loss?](https:\/\/www.wired.com\/story\/why-is-it-so-hard-to-study-covid-related-smell-loss\/)  (WIRED, September 25, 2020)\n- [What It’s Like to Lose Your Sense of Taste and Smell from Covid-19](https:\/\/www.thehealthy.com\/infectious-disease\/lost-taste-and-smell-from-covid-19\/) (The Healthy, September 15, 2020)\n- [Why COVID-19 Makes People Lose Their Sense of Smell](https:\/\/www.scientificamerican.com\/article\/why-covid-19-makes-people-lose-their-sense-of-smell1\/) (Scientific American, June 13, 2020)\n- [COVID-19, smell and taste - how is COVID-19 different from other respiratory diseases?](https:\/\/theconversation.com\/covid-19-smell-and-taste-how-is-covid-19-different-from-other-respiratory-diseases-139543) (The Conversation, June 4, 2020)\n- [Global survey shows link between COVID-19 patients and taste, smell loss](https:\/\/www.timesofisrael.com\/global-survey-illuminates-link-between-covid-19-patients-and-taste-smell-loss\/) (The Times of Israel, May 11, 2020)\n- [Potential link between COVID-19 and loss of smell, taste to be explored](https:\/\/news.psu.edu\/story\/613869\/2020\/04\/01\/research\/potential-link-between-covid-19-and-loss-smell-taste-be-explored) (Penn State News, April 1, 2020)\n\n*The [Penn State Sensory Evaluation Center](https:\/\/foodscience.psu.edu\/about\/facilities\/sensory) in the College of Agricultural Sciences is a hub of efforts to understand the link between anosmia and COVID-19. We’re hard at work with researchers, clinicians, and patients around the world. Together, we will nose out new ways to keep our community safe.*\n\n[*Back to Top*](https:\/\/agsci.psu.edu\/smellcheck#scroll-top)\n\n[![Penn State College of Agricultural Science Logo](https:\/\/assets.agsci.psu.edu\/++resource++agsci.common\/assets\/images\/psu-agr-logo-rev-single.png)](https:\/\/agsci.psu.edu\/)\n\n- University Park, PA 16802\n- [Directory](https:\/\/agsci.psu.edu\/directory)\n- [Contact Us](https:\/\/agsci.psu.edu\/contact)\n\n- [Facebook](https:\/\/www.facebook.com\/agsciences)\n- [X (Twitter)](https:\/\/twitter.com\/agsciences)\n- [Instagram](https:\/\/instagram.com\/agsciences)\n- [LinkedIn](https:\/\/www.linkedin.com\/company\/penn-state-college-of-agricultural-sciences)\n- [YouTube](https:\/\/www.youtube.com\/c\/PennStateAgSciences)\n\n[Privacy and Legal Statements](https:\/\/www.psu.edu\/legal-statements\/) — [Non-Discrimination](https:\/\/agsci.psu.edu\/non-discrimination) — [Accessibility](https:\/\/agsci.psu.edu\/accessibility) — [© 2026 The Pennsylvania State University](https:\/\/www.psu.edu\/copyright-information)\n\n![Penn State College of Agricultural Science Logo](https:\/\/assets.agsci.psu.edu\/++resource++agsci.common\/assets\/images\/PSU_AGR_RGB_2C.svg)","attrs_readable_markdown":"Your nose knows\n\nSudden loss of the sense of smell is one of the earliest signs and best predictors of COVID-19. Put your nose to work to keep yourself and others healthy. Perform daily smell checks to catch COVID-19 in its tracks and prevent its spread.\n\n## How Ag Sciences is fighting COVID\nFood Science might not be the first discipline that comes to mind in the battle against COVID-19. But in the spring of 2020, anecdotes of anosmia (the inability to smell) associated with coronavirus infection began to appear. More and more patients reported experiencing a sudden inability to smell. Researchers in the Penn State Department of Food Science were unexpectedly but uniquely prepared to investigate the connection. They quickly emerged as leaders in global research on COVID-19 and sudden smell loss.\n\n![](https:\/\/agsci.psu.edu\/smellcheck\/front-page\/@@agsci.common.tiles.dropdown_accordion\/b0f03b2b7542406dbe0be33908bb2833\/@@images\/image_0-0-d66ac12c67851b391ad46baec2f0e69d.jpeg)\n\n### Pivoting to meet a new challenge\nBefore the COVID-19 pandemic, Penn State food scientists [Dr. John Hayes](https:\/\/foodscience.psu.edu\/directory\/jeh40) and [Dr. Alyssa Bakke](https:\/\/foodscience.psu.edu\/directory\/abc18) used their expertise in taste biology, psychology, flavor perception, and other disciplines to better understand the human sensory experience. Their work in the [Penn State Sensory Evaluation Center](https:\/\/foodscience.psu.edu\/about\/facilities\/sensory) isn't focused only on controlled taste tests to quantify and optimize consumer products. They and fellow researchers also study human smell and taste perception directly to better understand how people differ in their sensory experiences.\n\nThe research team saw that they could redirect their expertise to COVID-19.\n\nWorking with over 600 clinicians, scientists, and patient advocates in more than 40 countries, Penn State researchers developed, distributed, and analyzed data from surveys that expanded and solidified our understanding of the virus’s link to anosmia (the inability to smell) and hyposmia (reduced ability to smell). More than 25,000 participants responded to a survey on behalf of the Global Consortium for Chemosensory Research. The results determined that 50 to 75 percent of those infected with COVID-19 experienced smell and\/or taste disturbances, establishing smell loss as a more accurate predictor of infection than cough or fever.\n\nAs research continues, scientists are optimistic that smell checks will become an effective public health tool that can be used to predict COVID-19 infection and mitigate its spread.\n\n## What you need to do\n![Stop Smell Be Well](https:\/\/agsci.psu.edu\/smellcheck\/images\/stopsmellbewell.png\/@@images\/image-800-decc32a4d7b0c34dd09b78e8b446d431.png)\n\n### Test your smell each day.\nYou can use your morning coffee, food, flowers, spices, perfume—you name it. Stop and take careful notice of whether or not you can smell.\n\nBe safe when you check.\n\n- Perform your sniff test alone with your mask off—and be sure to mask back up\\!\n- Even if you can smell, don’t throw caution to the wind. Always practice preventive behavior like social distancing, mask use, and frequent handwashing.\n\nMake it a habit.\n\n- Mark your calendar. Set an alarm. Make a daily smell check as routine as washing your face or brushing your teeth.\n- Actively and intentionally pay attention to your sense of smell each day.\n### If you can’t smell familiar scents, take action.\nSelf-isolate until you speak with a healthcare professional:\n\n- *Students at University Park:* Contact [University Health Services.](https:\/\/studentaffairs.psu.edu\/health)\n- *Students at other Penn State campuses:* Contact your [campus health center.](https:\/\/studentaffairs.psu.edu\/health-wellness\/medical-services\/health-services-commonwealth-campuses)\n- *Penn State personnel:* Contact [Penn State Occupational Medicine](https:\/\/hr.psu.edu\/occupational-medicine) at [psuoccmed@psu.edu](mailto:psuoccmed@psu.edu) or 814-863-8492.\n\n## The science behind it all\nIt's not just there to hold up your sunglasses—your nose is a sophisticated piece of diagnostic equipment\n\nAnosmia is the inability to smell, and can occur with viral illness or head trauma. Sudden and unexplained loss of the sense of smell has emerged as a critical diagnostic marker of COVID-19.\n\n### How It Works\nCOVID-19’s first stop in the human body are support cells in the top of the nasal cavity. These cells express lots of the ACE2 receptor that the virus uses to sneak into cells. When these cells are attacked, we can’t smell because of local inflammation that disrupts our smell receptors, the link between odors and our brain.\n\nAs many as 75 percent of those infected with COVID report smell loss. Anosmia is one of the earliest signs and accurate predictors of COVID-19. In fact, it’s a better diagnostic symptom than fever and cough. That’s even more true with those who don’t otherwise feel unwell. Unlike other viruses, many people with COVID-19 can experience smell loss without a runny nose or any congestion.\n\n### Remember—Anosmia is just one symptom of COVID-19.\nEven if your sense of smell is working, you may not be in the clear. Also monitor yourself for all of the symptoms indicated by the [Centers for Disease Control and Prevention](https:\/\/www.cdc.gov\/coronavirus\/2019-ncov\/index.html). If you exhibit symptoms or have been in contact with someone who has, self-isolate and contact University Health Services, your campus health center, or your primary care provider.\n\nCOVID-19 symptoms to watch for:\n\n- Fever or chills\n- Cough\n- Shortness of breath or difficulty breathing\n- Fatigue\n- Muscle or body aches\n- Headache\n- New loss of taste or smell\n- Sore throat\n- Congestion or runny nose\n- Nausea or vomiting\n- Diarrhea\n\n## Resources\n### Penn State COVID-19 Tools and Information\n- [Penn State Go App](https:\/\/mobile.psu.edu\/): Download for symptom checker, FAQs, and more\n- [Back to State](https:\/\/virusinfo.psu.edu\/back-to-state): Keeping the University safe\n- [Coronavirus Information](https:\/\/virusinfo.psu.edu\/): Updates for the Penn State community\n- [Campus Health Services](https:\/\/studentaffairs.psu.edu\/health-wellness\/medical-services\/health-services-commonwealth-campuses): Details on campus resources at across the state\n- [University Health Services](https:\/\/studentaffairs.psu.edu\/health): Comprehensive health care resources at University Park\n- [Penn State Occupational Medicine](https:\/\/hr.psu.edu\/occupational-medicine): Full-service occupational and environmental medicine practice serving Penn State employees\n### In the News: COVID-19 and Sense of Smell\n- [Can you smell your coffee? If not, you should get tested for COVID-19](https:\/\/www.fastcompany.com\/90585051\/sniff-check-covid-19-early-detection) (Fast Company, December 11, 2020)\n- [Smell and taste changes are early indicators of the COVID-19 pandemic and political decision effectiveness](https:\/\/www.nature.com\/articles\/s41467-020-18963-y) (Nature Communications, October 14, 2020)\n- [Penn State sensory scientists encourage smell checks to fight COVID-19 spread](https:\/\/news.psu.edu\/story\/634903\/2020\/10\/08\/research\/penn-state-sensory-scientists-encourage-smell-checks-fight-covid-19) (Penn State News, October 8, 2020)\n- [Why Is It So Hard to Study Covid-Related Smell Loss?](https:\/\/www.wired.com\/story\/why-is-it-so-hard-to-study-covid-related-smell-loss\/)  (WIRED, September 25, 2020)\n- [What It’s Like to Lose Your Sense of Taste and Smell from Covid-19](https:\/\/www.thehealthy.com\/infectious-disease\/lost-taste-and-smell-from-covid-19\/) (The Healthy, September 15, 2020)\n- [Why COVID-19 Makes People Lose Their Sense of Smell](https:\/\/www.scientificamerican.com\/article\/why-covid-19-makes-people-lose-their-sense-of-smell1\/) (Scientific American, June 13, 2020)\n- [COVID-19, smell and taste - how is COVID-19 different from other respiratory diseases?](https:\/\/theconversation.com\/covid-19-smell-and-taste-how-is-covid-19-different-from-other-respiratory-diseases-139543) (The Conversation, June 4, 2020)\n- [Global survey shows link between COVID-19 patients and taste, smell loss](https:\/\/www.timesofisrael.com\/global-survey-illuminates-link-between-covid-19-patients-and-taste-smell-loss\/) (The Times of Israel, May 11, 2020)\n- [Potential link between COVID-19 and loss of smell, taste to be explored](https:\/\/news.psu.edu\/story\/613869\/2020\/04\/01\/research\/potential-link-between-covid-19-and-loss-smell-taste-be-explored) (Penn State News, April 1, 2020)\n\n*The [Penn State Sensory Evaluation Center](https:\/\/foodscience.psu.edu\/about\/facilities\/sensory) in the College of Agricultural Sciences is a hub of efforts to understand the link between anosmia and COVID-19. We’re hard at work with researchers, clinicians, and patients around the world. Together, we will nose out new ways to keep our community safe.*","meta_canonical":null}

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Meta Title	COVID-19 Smell Check — Penn State College of Agricultural Sciences
Meta Description	Sudden loss of the sense of smell, anosmia, is one of the earliest signs and best predictors of COVID-19. Put your nose to work to keep yourself and others healthy. Perform daily smell checks to catch COVID-19 in its tracks and prevent its spread.
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Boilerpipe Text	Your nose knows Sudden loss of the sense of smell is one of the earliest signs and best predictors of COVID-19. Put your nose to work to keep yourself and others healthy. Perform daily smell checks to catch COVID-19 in its tracks and prevent its spread. How Ag Sciences is fighting COVID Food Science might not be the first discipline that comes to mind in the battle against COVID-19. But in the spring of 2020, anecdotes of anosmia (the inability to smell) associated with coronavirus infection began to appear. More and more patients reported experiencing a sudden inability to smell. Researchers in the Penn State Department of Food Science were unexpectedly but uniquely prepared to investigate the connection. They quickly emerged as leaders in global research on COVID-19 and sudden smell loss. Pivoting to meet a new challenge Before the COVID-19 pandemic, Penn State food scientists Dr. John Hayes and Dr. Alyssa Bakke used their expertise in taste biology, psychology, flavor perception, and other disciplines to better understand the human sensory experience. Their work in the Penn State Sensory Evaluation Center isn't focused only on controlled taste tests to quantify and optimize consumer products. They and fellow researchers also study human smell and taste perception directly to better understand how people differ in their sensory experiences. The research team saw that they could redirect their expertise to COVID-19. Working with over 600 clinicians, scientists, and patient advocates in more than 40 countries, Penn State researchers developed, distributed, and analyzed data from surveys that expanded and solidified our understanding of the virus’s link to anosmia (the inability to smell) and hyposmia (reduced ability to smell). More than 25,000 participants responded to a survey on behalf of the Global Consortium for Chemosensory Research. The results determined that 50 to 75 percent of those infected with COVID-19 experienced smell and/or taste disturbances, establishing smell loss as a more accurate predictor of infection than cough or fever. As research continues, scientists are optimistic that smell checks will become an effective public health tool that can be used to predict COVID-19 infection and mitigate its spread. What you need to do Test your smell each day. You can use your morning coffee, food, flowers, spices, perfume—you name it. Stop and take careful notice of whether or not you can smell. Be safe when you check. Perform your sniff test alone with your mask off—and be sure to mask back up! Even if you can smell, don’t throw caution to the wind. Always practice preventive behavior like social distancing, mask use, and frequent handwashing. Make it a habit. Mark your calendar. Set an alarm. Make a daily smell check as routine as washing your face or brushing your teeth. Actively and intentionally pay attention to your sense of smell each day. If you can’t smell familiar scents, take action. Self-isolate until you speak with a healthcare professional: Students at University Park: Contact University Health Services. Students at other Penn State campuses: Contact your campus health center. Penn State personnel: Contact Penn State Occupational Medicine at psuoccmed@psu.edu or 814-863-8492. The science behind it all It's not just there to hold up your sunglasses—your nose is a sophisticated piece of diagnostic equipment Anosmia is the inability to smell, and can occur with viral illness or head trauma. Sudden and unexplained loss of the sense of smell has emerged as a critical diagnostic marker of COVID-19. How It Works COVID-19’s first stop in the human body are support cells in the top of the nasal cavity. These cells express lots of the ACE2 receptor that the virus uses to sneak into cells. When these cells are attacked, we can’t smell because of local inflammation that disrupts our smell receptors, the link between odors and our brain. As many as 75 percent of those infected with COVID report smell loss. Anosmia is one of the earliest  signs and accurate predictors of COVID-19. In fact, it’s a better diagnostic symptom than fever and cough. That’s even more true with those who don’t otherwise feel unwell. Unlike other viruses, many people with COVID-19 can experience smell loss without a runny nose or any congestion.   Remember—Anosmia is just one symptom of COVID-19. Even if your sense of smell is working, you may not be in the clear. Also monitor yourself for all of the symptoms indicated by the Centers for Disease Control and Prevention . If you exhibit symptoms or have been in contact with someone who has, self-isolate and contact University Health Services, your campus health center, or your primary care provider. COVID-19 symptoms to watch for: Fever or chills Cough Shortness of breath or difficulty breathing Fatigue Muscle or body aches Headache New loss of taste or smell Sore throat Congestion or runny nose Nausea or vomiting Diarrhea Resources Penn State COVID-19 Tools and Information Penn State Go App : Download for symptom checker, FAQs, and more Back to State : Keeping the University safe Coronavirus Information : Updates for the Penn State community Campus Health Services : Details on campus resources at across the state University Health Services : Comprehensive health care resources at University Park Penn State Occupational Medicine : Full-service occupational and environmental medicine practice serving Penn State employees In the News: COVID-19 and Sense of Smell Can you smell your coffee? If not, you should get tested for COVID-19 (Fast Company, December 11, 2020) Smell and taste changes are early indicators of the COVID-19 pandemic and political decision effectiveness (Nature Communications, October 14, 2020) Penn State sensory scientists encourage smell checks to fight COVID-19 spread (Penn State News, October 8, 2020) Why Is It So Hard to Study Covid-Related Smell Loss? (WIRED, September 25, 2020) What It’s Like to Lose Your Sense of Taste and Smell from Covid-19 (The Healthy, September 15, 2020) Why COVID-19 Makes People Lose Their Sense of Smell (Scientific American, June 13, 2020) COVID-19, smell and taste - how is COVID-19 different from other respiratory diseases? (The Conversation, June 4, 2020) Global survey shows link between COVID-19 patients and taste, smell loss (The Times of Israel, May 11, 2020) Potential link between COVID-19 and loss of smell, taste to be explored (Penn State News, April 1, 2020) The Penn State Sensory Evaluation Center in the College of Agricultural Sciences is a hub of efforts to understand the link between anosmia and COVID-19. We’re hard at work with researchers, clinicians, and patients around the world. Together, we will nose out new ways to keep our community safe.
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Smell. Be well. ## COVID-19 Smell Check Your nose knows Sudden loss of the sense of smell is one of the earliest signs and best predictors of COVID-19. Put your nose to work to keep yourself and others healthy. Perform daily smell checks to catch COVID-19 in its tracks and prevent its spread. ## How Ag Sciences is fighting COVID Food Science might not be the first discipline that comes to mind in the battle against COVID-19. But in the spring of 2020, anecdotes of anosmia (the inability to smell) associated with coronavirus infection began to appear. More and more patients reported experiencing a sudden inability to smell. Researchers in the Penn State Department of Food Science were unexpectedly but uniquely prepared to investigate the connection. They quickly emerged as leaders in global research on COVID-19 and sudden smell loss. Learn More ![](https://agsci.psu.edu/smellcheck/front-page/@@agsci.common.tiles.dropdown_accordion/b0f03b2b7542406dbe0be33908bb2833/@@images/image_0-0-d66ac12c67851b391ad46baec2f0e69d.jpeg) ### Pivoting to meet a new challenge Before the COVID-19 pandemic, Penn State food scientists [Dr. John Hayes](https://foodscience.psu.edu/directory/jeh40) and [Dr. Alyssa Bakke](https://foodscience.psu.edu/directory/abc18) used their expertise in taste biology, psychology, flavor perception, and other disciplines to better understand the human sensory experience. Their work in the [Penn State Sensory Evaluation Center](https://foodscience.psu.edu/about/facilities/sensory) isn't focused only on controlled taste tests to quantify and optimize consumer products. They and fellow researchers also study human smell and taste perception directly to better understand how people differ in their sensory experiences. The research team saw that they could redirect their expertise to COVID-19. Working with over 600 clinicians, scientists, and patient advocates in more than 40 countries, Penn State researchers developed, distributed, and analyzed data from surveys that expanded and solidified our understanding of the virus’s link to anosmia (the inability to smell) and hyposmia (reduced ability to smell). More than 25,000 participants responded to a survey on behalf of the Global Consortium for Chemosensory Research. The results determined that 50 to 75 percent of those infected with COVID-19 experienced smell and/or taste disturbances, establishing smell loss as a more accurate predictor of infection than cough or fever. As research continues, scientists are optimistic that smell checks will become an effective public health tool that can be used to predict COVID-19 infection and mitigate its spread. ## What you need to do ![Stop Smell Be Well](https://agsci.psu.edu/smellcheck/images/stopsmellbewell.png/@@images/image-800-decc32a4d7b0c34dd09b78e8b446d431.png) ### Test your smell each day. You can use your morning coffee, food, flowers, spices, perfume—you name it. Stop and take careful notice of whether or not you can smell. Be safe when you check. - Perform your sniff test alone with your mask off—and be sure to mask back up\! - Even if you can smell, don’t throw caution to the wind. Always practice preventive behavior like social distancing, mask use, and frequent handwashing. Make it a habit. - Mark your calendar. Set an alarm. Make a daily smell check as routine as washing your face or brushing your teeth. - Actively and intentionally pay attention to your sense of smell each day. ### If you can’t smell familiar scents, take action. Self-isolate until you speak with a healthcare professional: - Students at University Park: Contact [University Health Services.](https://studentaffairs.psu.edu/health) - Students at other Penn State campuses: Contact your [campus health center.](https://studentaffairs.psu.edu/health-wellness/medical-services/health-services-commonwealth-campuses) - Penn State personnel: Contact [Penn State Occupational Medicine](https://hr.psu.edu/occupational-medicine) at [psuoccmed@psu.edu](mailto:psuoccmed@psu.edu) or 814-863-8492. ## The science behind it all It's not just there to hold up your sunglasses—your nose is a sophisticated piece of diagnostic equipment Anosmia is the inability to smell, and can occur with viral illness or head trauma. Sudden and unexplained loss of the sense of smell has emerged as a critical diagnostic marker of COVID-19. ### How It Works COVID-19’s first stop in the human body are support cells in the top of the nasal cavity. These cells express lots of the ACE2 receptor that the virus uses to sneak into cells. When these cells are attacked, we can’t smell because of local inflammation that disrupts our smell receptors, the link between odors and our brain. As many as 75 percent of those infected with COVID report smell loss. Anosmia is one of the earliest signs and accurate predictors of COVID-19. In fact, it’s a better diagnostic symptom than fever and cough. That’s even more true with those who don’t otherwise feel unwell. Unlike other viruses, many people with COVID-19 can experience smell loss without a runny nose or any congestion. ### Remember—Anosmia is just one symptom of COVID-19. Even if your sense of smell is working, you may not be in the clear. Also monitor yourself for all of the symptoms indicated by the [Centers for Disease Control and Prevention](https://www.cdc.gov/coronavirus/2019-ncov/index.html). If you exhibit symptoms or have been in contact with someone who has, self-isolate and contact University Health Services, your campus health center, or your primary care provider. COVID-19 symptoms to watch for: - Fever or chills - Cough - Shortness of breath or difficulty breathing - Fatigue - Muscle or body aches - Headache - New loss of taste or smell - Sore throat - Congestion or runny nose - Nausea or vomiting - Diarrhea ## Resources ### Penn State COVID-19 Tools and Information - [Penn State Go App](https://mobile.psu.edu/): Download for symptom checker, FAQs, and more - [Back to State](https://virusinfo.psu.edu/back-to-state): Keeping the University safe - [Coronavirus Information](https://virusinfo.psu.edu/): Updates for the Penn State community - [Campus Health Services](https://studentaffairs.psu.edu/health-wellness/medical-services/health-services-commonwealth-campuses): Details on campus resources at across the state - [University Health Services](https://studentaffairs.psu.edu/health): Comprehensive health care resources at University Park - [Penn State Occupational Medicine](https://hr.psu.edu/occupational-medicine): Full-service occupational and environmental medicine practice serving Penn State employees ### In the News: COVID-19 and Sense of Smell - [Can you smell your coffee? If not, you should get tested for COVID-19](https://www.fastcompany.com/90585051/sniff-check-covid-19-early-detection) (Fast Company, December 11, 2020) - [Smell and taste changes are early indicators of the COVID-19 pandemic and political decision effectiveness](https://www.nature.com/articles/s41467-020-18963-y) (Nature Communications, October 14, 2020) - [Penn State sensory scientists encourage smell checks to fight COVID-19 spread](https://news.psu.edu/story/634903/2020/10/08/research/penn-state-sensory-scientists-encourage-smell-checks-fight-covid-19) (Penn State News, October 8, 2020) - [Why Is It So Hard to Study Covid-Related Smell Loss?](https://www.wired.com/story/why-is-it-so-hard-to-study-covid-related-smell-loss/) (WIRED, September 25, 2020) - [What It’s Like to Lose Your Sense of Taste and Smell from Covid-19](https://www.thehealthy.com/infectious-disease/lost-taste-and-smell-from-covid-19/) (The Healthy, September 15, 2020) - [Why COVID-19 Makes People Lose Their Sense of Smell](https://www.scientificamerican.com/article/why-covid-19-makes-people-lose-their-sense-of-smell1/) (Scientific American, June 13, 2020) - [COVID-19, smell and taste - how is COVID-19 different from other respiratory diseases?](https://theconversation.com/covid-19-smell-and-taste-how-is-covid-19-different-from-other-respiratory-diseases-139543) (The Conversation, June 4, 2020) - [Global survey shows link between COVID-19 patients and taste, smell loss](https://www.timesofisrael.com/global-survey-illuminates-link-between-covid-19-patients-and-taste-smell-loss/) (The Times of Israel, May 11, 2020) - [Potential link between COVID-19 and loss of smell, taste to be explored](https://news.psu.edu/story/613869/2020/04/01/research/potential-link-between-covid-19-and-loss-smell-taste-be-explored) (Penn State News, April 1, 2020) The [Penn State Sensory Evaluation Center](https://foodscience.psu.edu/about/facilities/sensory) in the College of Agricultural Sciences is a hub of efforts to understand the link between anosmia and COVID-19. We’re hard at work with researchers, clinicians, and patients around the world. Together, we will nose out new ways to keep our community safe. [Back to Top](https://agsci.psu.edu/smellcheck#scroll-top) [![Penn State College of Agricultural Science Logo](https://assets.agsci.psu.edu/++resource++agsci.common/assets/images/psu-agr-logo-rev-single.png)](https://agsci.psu.edu/) - University Park, PA 16802 - [Directory](https://agsci.psu.edu/directory) - [Contact Us](https://agsci.psu.edu/contact) - [Facebook](https://www.facebook.com/agsciences) - [X (Twitter)](https://twitter.com/agsciences) - [Instagram](https://instagram.com/agsciences) - [LinkedIn](https://www.linkedin.com/company/penn-state-college-of-agricultural-sciences) - [YouTube](https://www.youtube.com/c/PennStateAgSciences) [Privacy and Legal Statements](https://www.psu.edu/legal-statements/) — [Non-Discrimination](https://agsci.psu.edu/non-discrimination) — [Accessibility](https://agsci.psu.edu/accessibility) — [© 2026 The Pennsylvania State University](https://www.psu.edu/copyright-information) ![Penn State College of Agricultural Science Logo](https://assets.agsci.psu.edu/++resource++agsci.common/assets/images/PSU_AGR_RGB_2C.svg)
Readable Markdown	Your nose knows Sudden loss of the sense of smell is one of the earliest signs and best predictors of COVID-19. Put your nose to work to keep yourself and others healthy. Perform daily smell checks to catch COVID-19 in its tracks and prevent its spread. ## How Ag Sciences is fighting COVID Food Science might not be the first discipline that comes to mind in the battle against COVID-19. But in the spring of 2020, anecdotes of anosmia (the inability to smell) associated with coronavirus infection began to appear. More and more patients reported experiencing a sudden inability to smell. Researchers in the Penn State Department of Food Science were unexpectedly but uniquely prepared to investigate the connection. They quickly emerged as leaders in global research on COVID-19 and sudden smell loss. ![](https://agsci.psu.edu/smellcheck/front-page/@@agsci.common.tiles.dropdown_accordion/b0f03b2b7542406dbe0be33908bb2833/@@images/image_0-0-d66ac12c67851b391ad46baec2f0e69d.jpeg) ### Pivoting to meet a new challenge Before the COVID-19 pandemic, Penn State food scientists [Dr. John Hayes](https://foodscience.psu.edu/directory/jeh40) and [Dr. Alyssa Bakke](https://foodscience.psu.edu/directory/abc18) used their expertise in taste biology, psychology, flavor perception, and other disciplines to better understand the human sensory experience. Their work in the [Penn State Sensory Evaluation Center](https://foodscience.psu.edu/about/facilities/sensory) isn't focused only on controlled taste tests to quantify and optimize consumer products. They and fellow researchers also study human smell and taste perception directly to better understand how people differ in their sensory experiences. The research team saw that they could redirect their expertise to COVID-19. Working with over 600 clinicians, scientists, and patient advocates in more than 40 countries, Penn State researchers developed, distributed, and analyzed data from surveys that expanded and solidified our understanding of the virus’s link to anosmia (the inability to smell) and hyposmia (reduced ability to smell). More than 25,000 participants responded to a survey on behalf of the Global Consortium for Chemosensory Research. The results determined that 50 to 75 percent of those infected with COVID-19 experienced smell and/or taste disturbances, establishing smell loss as a more accurate predictor of infection than cough or fever. As research continues, scientists are optimistic that smell checks will become an effective public health tool that can be used to predict COVID-19 infection and mitigate its spread. ## What you need to do ![Stop Smell Be Well](https://agsci.psu.edu/smellcheck/images/stopsmellbewell.png/@@images/image-800-decc32a4d7b0c34dd09b78e8b446d431.png) ### Test your smell each day. You can use your morning coffee, food, flowers, spices, perfume—you name it. Stop and take careful notice of whether or not you can smell. Be safe when you check. - Perform your sniff test alone with your mask off—and be sure to mask back up\! - Even if you can smell, don’t throw caution to the wind. Always practice preventive behavior like social distancing, mask use, and frequent handwashing. Make it a habit. - Mark your calendar. Set an alarm. Make a daily smell check as routine as washing your face or brushing your teeth. - Actively and intentionally pay attention to your sense of smell each day. ### If you can’t smell familiar scents, take action. Self-isolate until you speak with a healthcare professional: - Students at University Park: Contact [University Health Services.](https://studentaffairs.psu.edu/health) - Students at other Penn State campuses: Contact your [campus health center.](https://studentaffairs.psu.edu/health-wellness/medical-services/health-services-commonwealth-campuses) - Penn State personnel: Contact [Penn State Occupational Medicine](https://hr.psu.edu/occupational-medicine) at [psuoccmed@psu.edu](mailto:psuoccmed@psu.edu) or 814-863-8492. ## The science behind it all It's not just there to hold up your sunglasses—your nose is a sophisticated piece of diagnostic equipment Anosmia is the inability to smell, and can occur with viral illness or head trauma. Sudden and unexplained loss of the sense of smell has emerged as a critical diagnostic marker of COVID-19. ### How It Works COVID-19’s first stop in the human body are support cells in the top of the nasal cavity. These cells express lots of the ACE2 receptor that the virus uses to sneak into cells. When these cells are attacked, we can’t smell because of local inflammation that disrupts our smell receptors, the link between odors and our brain. As many as 75 percent of those infected with COVID report smell loss. Anosmia is one of the earliest signs and accurate predictors of COVID-19. In fact, it’s a better diagnostic symptom than fever and cough. That’s even more true with those who don’t otherwise feel unwell. Unlike other viruses, many people with COVID-19 can experience smell loss without a runny nose or any congestion. ### Remember—Anosmia is just one symptom of COVID-19. Even if your sense of smell is working, you may not be in the clear. Also monitor yourself for all of the symptoms indicated by the [Centers for Disease Control and Prevention](https://www.cdc.gov/coronavirus/2019-ncov/index.html). If you exhibit symptoms or have been in contact with someone who has, self-isolate and contact University Health Services, your campus health center, or your primary care provider. COVID-19 symptoms to watch for: - Fever or chills - Cough - Shortness of breath or difficulty breathing - Fatigue - Muscle or body aches - Headache - New loss of taste or smell - Sore throat - Congestion or runny nose - Nausea or vomiting - Diarrhea ## Resources ### Penn State COVID-19 Tools and Information - [Penn State Go App](https://mobile.psu.edu/): Download for symptom checker, FAQs, and more - [Back to State](https://virusinfo.psu.edu/back-to-state): Keeping the University safe - [Coronavirus Information](https://virusinfo.psu.edu/): Updates for the Penn State community - [Campus Health Services](https://studentaffairs.psu.edu/health-wellness/medical-services/health-services-commonwealth-campuses): Details on campus resources at across the state - [University Health Services](https://studentaffairs.psu.edu/health): Comprehensive health care resources at University Park - [Penn State Occupational Medicine](https://hr.psu.edu/occupational-medicine): Full-service occupational and environmental medicine practice serving Penn State employees ### In the News: COVID-19 and Sense of Smell - [Can you smell your coffee? If not, you should get tested for COVID-19](https://www.fastcompany.com/90585051/sniff-check-covid-19-early-detection) (Fast Company, December 11, 2020) - [Smell and taste changes are early indicators of the COVID-19 pandemic and political decision effectiveness](https://www.nature.com/articles/s41467-020-18963-y) (Nature Communications, October 14, 2020) - [Penn State sensory scientists encourage smell checks to fight COVID-19 spread](https://news.psu.edu/story/634903/2020/10/08/research/penn-state-sensory-scientists-encourage-smell-checks-fight-covid-19) (Penn State News, October 8, 2020) - [Why Is It So Hard to Study Covid-Related Smell Loss?](https://www.wired.com/story/why-is-it-so-hard-to-study-covid-related-smell-loss/) (WIRED, September 25, 2020) - [What It’s Like to Lose Your Sense of Taste and Smell from Covid-19](https://www.thehealthy.com/infectious-disease/lost-taste-and-smell-from-covid-19/) (The Healthy, September 15, 2020) - [Why COVID-19 Makes People Lose Their Sense of Smell](https://www.scientificamerican.com/article/why-covid-19-makes-people-lose-their-sense-of-smell1/) (Scientific American, June 13, 2020) - [COVID-19, smell and taste - how is COVID-19 different from other respiratory diseases?](https://theconversation.com/covid-19-smell-and-taste-how-is-covid-19-different-from-other-respiratory-diseases-139543) (The Conversation, June 4, 2020) - [Global survey shows link between COVID-19 patients and taste, smell loss](https://www.timesofisrael.com/global-survey-illuminates-link-between-covid-19-patients-and-taste-smell-loss/) (The Times of Israel, May 11, 2020) - [Potential link between COVID-19 and loss of smell, taste to be explored](https://news.psu.edu/story/613869/2020/04/01/research/potential-link-between-covid-19-and-loss-smell-taste-be-explored) (Penn State News, April 1, 2020) The [Penn State Sensory Evaluation Center](https://foodscience.psu.edu/about/facilities/sensory) in the College of Agricultural Sciences is a hub of efforts to understand the link between anosmia and COVID-19. We’re hard at work with researchers, clinicians, and patients around the world. Together, we will nose out new ways to keep our community safe.
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