🕷️ Crawler Inspector

URL Lookup

Direct Parameter Lookup

Raw Queries and Responses

1. Shard Calculation

Query:

Response:

Calculated Shard: 116 (from laksa143)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa116.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, ml_categories_json AS ml_categories_json, ml_types_json AS ml_types_json, ml_intent_types_json AS ml_intent_types_json, meta_language AS meta_language, attrs_author AS attrs_author, ifNull(toUnixTimestamp(attrs_publish_time), 0) AS attrs_publish_time, ifNull(toUnixTimestamp(attrs_original_publish_time), 0) AS attrs_original_publish_time, ifNull(attrs_is_republished, 0) AS attrs_is_republished, ifNull(attrs_nr_words, 0) AS attrs_nr_words, ifNull(attrs_boilerpipe_nr_words, 0) AS attrs_boilerpipe_nr_words, ifNull(body_ext_links_number, 0) AS body_ext_links_number, ifNull(body_int_links_number, 0) AS body_int_links_number, ifNull(meta_nofollow, 0) AS meta_nofollow, ifNull(meta_noarchive, 0) AS meta_noarchive, ifNull(props_was_rendered, 0) AS props_was_rendered, ifNull(src_redirect, \'\') AS src_redirect, ifNull(download_time_msec, 0) AS download_time_msec, ifNull(download_ttfb_msec, 0) AS download_ttfb_msec, ifNull(download_size, 0) AS download_size FROM crawler3.page_info_local FINAL PREWHERE (src_root_hash, src_unparsed) IN ((getAhrefsRootHashFromUnparsed(getAhrefsUnparsedNoserviceFromURL(\'https://www.hopkinsmedicine.org/health/conditions-and-diseases/coronavirus\')), getAhrefsUnparsedNoserviceFromURL(\'https://www.hopkinsmedicine.org/health/conditions-and-diseases/coronavirus\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/www.hopkinsmedicine.org\/health\/conditions-and-diseases\/coronavirus","crawl_time":1777008449,"first_indexed_time":1580350811,"http_code":200,"src_unparsed":"org,hopkinsmedicine!www,\/health\/conditions-and-diseases\/coronavirus s443","src_root_hash":"4754538707639265316","history_drop_reason":null,"meta_title":"COVID-19 | Johns Hopkins Medicine","meta_descriptions":["COVID-19 is the disease caused by SARS-CoV-2, the coronavirus that emerged in December 2019. Learn about symptoms, diagnosis, treatment and prevention."],"attrs_boilerpipe_text":"COVID-19 is the disease caused by SARS-CoV-2, the coronavirus that emerged in December 2019. Learn about symptoms, diagnosis, treatment and prevention.\nWhat is COVID-19?\nCOVID-19 is the disease caused by SARS-CoV-2, the coronavirus that emerged in December 2019.\nCoronaviruses are a type of virus. There are many different kinds, and some, like COVID-19, cause disease and sometimes death.\nWhat You Need to Know\nCOVID-19 can be severe, and has caused millions of deaths around the world as well as lasting health problems in some who have survived the illness.\nHowever, some with COVID-19 develop only mild symptoms—or experience no symptoms at all.\nThe best way to protect yourself is to get vaccinated, wash your hands, and follow respiratory etiquette. If you think you may have COVID-19, follow testing guidelines, wear a mask, and practice physical distancing.\nWhat are symptoms of COVID-19?\nCOVID-19 symptoms include:\nCough\nFever or chills\nShortness of breath or difficulty breathing\nMuscle or body aches\nSore throat\nNew loss of taste or smell\nDiarrhea\nHeadache\nNew fatigue\nNausea or vomiting\nCongestion or runny nose\nSome people infected with COVID-19 have mild illness, and others have no symptoms at all. In some cases, however, COVID-19 can lead to respiratory failure, lasting lung and heart muscle damage, nervous system problems, kidney failure or death.\nIf you have a fever or any of the symptoms listed above, call your doctor or a health care provider and explain your symptoms over the phone before going to the doctor’s office, urgent care facility or emergency room.\nCALL 911 if you have a medical emergency such as severe shortness of breath or difficulty breathing.\nHow long do COVID-19 symptoms last?\nActive illness can last one to two weeks if you have mild or moderate coronavirus disease, but severe cases can last months. Some people are asymptomatic, meaning they never have symptoms but do have COVID-19.\nPost-COVID-19 symptoms, such as lingering cough, on and off fever, weakness, and changes to your senses of smell or taste, can persist for weeks or even months after you recover from acute illness. Persistent symptoms are sometimes known as \nlong COVID-19\n.\nHow does COVID-19 spread?\nCOVID-19 is spread through droplets and virus particles released into the air when an infected person breathes, talks, laughs, sings, coughs or sneezes.\nLarger droplets may fall to the ground in a few seconds, but tiny infectious particles can linger in the air and accumulate in indoor places, especially where many people are gathered and there is poor ventilation. This is why mask-wearing, hand hygiene and isolation practices for people infected with COVID-19 are essential to preventing COVID-19 transmission.\nWhat is the incubation period for COVID-19?\nSymptoms show up in people within two to 14 days of exposure to the virus. A person infected with COVID-19 is contagious to others for up to two days before symptoms appear, and they remain contagious to others for 10 to 20 days, depending upon their immune system and the severity of their illness. \nHow is COVID-19 diagnosed?\nCOVID-19 is diagnosed through a test. Diagnosis by examination alone is difficult since many COVID-19 signs and symptoms can be caused by other illnesses. Some people do not have symptoms at all. \nThere are two basic types of tests for COVID-19.\nViral test:\n This test can tell you if you are \ncurrently infected\n with the coronavirus. A swab is placed in the nose or mouth to gather samples. There are two types of viral tests: laboratory tests (sometimes called polymerase chain reaction [PCR] tests), and rapid tests that detect portions of the virus called antigens.\nLaboratory coronavirus tests\nare given by health care professionals, and results may take a day or more to receive. Since the samples are analyzed in a laboratory, they are very accurate and are often recommended for people with COVID-19 symptoms.\nRapid antigen tests\nmay be performed in pharmacies or health care facilities, or as self-tests at home. Rapid tests provide results in about 15 minutes. These tests are recommended if you do not have symptoms or if you are taking the test as a risk-prevention measure, such as before going on a work trip or seeing a friend, and you want to be sure you don’t have the coronavirus that causes COVID-19.\nAntibody test:\n This is a blood test that can show if you were \npreviously exposed\n to or infected with the virus that causes COVID-19, and if your body has created antibodies in an attempt to defend itself. It takes at least 12 days after exposure for your body to make enough antibodies to show up on a test. Antibody tests are not recommended to determine if you currently have COVID-19.\nThis test helps scientists gather data about how the immune system fights off COVID-19 in recovered patients. A positive antibody test means the person has some level of immune protection either from prior infection or from vaccination, but it is not a guarantee of protection from getting re-infected with the virus. Antibody levels decrease over time, and it is not clear how long antibody protection lasts.\nCOVID-19 and MIS-C: Tyona's Story\nCOVID-19 and a related inflammatory disorder was hardly the gift this Baltimore teen wished for on her 18th birthday. Read more about her care in the pediatric intensive care unit at Johns Hopkins Children’s Center.\nWhat are risk factors for COVID-19?\nAnyone can catch COVID-19, but some people are at higher risk for serious infection. They include people age 65 and older, women who are pregnant and people with certain illnesses. COVID-19 vaccines (and additional doses when appropriate) are especially recommended for people in these groups.\nHow is COVID-19 treated?\nTreatment for COVID-19 depends on the severity of the infection. For milder illness, resting at home and taking medicine to reduce fever is often sufficient. More severe cases may require hospitalization, with treatment that might include intravenous medications, supplemental oxygen, assisted ventilation and other supportive measures\nHow do you protect yourself from COVID-19?\nThere are several COVID-19 vaccines recommended by the CDC.\nLearn more about the COVID-19 vaccine\n.\nIn addition, it helps to keep up with other safety precautions, such as following testing guidelines, wearing a mask, washing your hands and staying at home when you are sick.\nAre there different variants of COVID-19?\nYes, there are different variants of this coronavirus. Like other viruses, the coronavirus that causes COVID-19 can change (mutate). Mutations may enable the coronavirus to spread faster from person to person. More infections can result in more people getting very sick and also create more opportunity for the virus to develop further mutations.\nCOVID-19 Research at Johns Hopkins\nExperts at Johns Hopkins are continuing to investigate COVID-19 causes, treatment, impact and prevention. ","attrs_markdown":"[Skip to Main Content](https:\/\/www.hopkinsmedicine.org\/health\/conditions-and-diseases\/coronavirus#skip)\n\n[![Johns Hopkins Medicine](https:\/\/www.hopkinsmedicine.org\/-\/media\/images\/hopkins-medicine-logo-white-header.svg?iar=0&hash=C6173D209DB591FDF4EFE00B18C2FFE4)](https:\/\/www.hopkinsmedicine.org\/)\n\nJohns Hopkins Medicine  Menu\n\n- [Health](https:\/\/www.hopkinsmedicine.org\/health)\n- [School of Medicine](https:\/\/www.hopkinsmedicine.org\/som)\n- [Johns Hopkins Medicine Home](https:\/\/www.hopkinsmedicine.org\/)\n- [About](https:\/\/www.hopkinsmedicine.org\/about)\n- [Patient Care](https:\/\/www.hopkinsmedicine.org\/patient-care)\n- [Research](https:\/\/www.hopkinsmedicine.org\/research)\n\n- [MyChart](https:\/\/mychart.hopkinsmedicine.org\/)\n- [Schedule an Appointment](https:\/\/www.hopkinsmedicine.org\/patient-care\/johns-hopkins-medicine-request-appointment)\n- [Find a Doctor](https:\/\/www.hopkinsmedicine.org\/profiles)\n- [Find a Clinical Trial](https:\/\/www.hopkinsmedicine.org\/clinical-trials)\n- [Pay Your Bill](https:\/\/www.hopkinsmedicine.org\/patient-care\/patients-visitors\/billing-insurance\/pay-bill)\n- [Employment](https:\/\/www.hopkinsmedicine.org\/employment)\n\nClose\n\nSearch\n\nClose\n\n[MyChart Login MyChart](https:\/\/mychart.hopkinsmedicine.org\/)\n\n[Home](https:\/\/www.hopkinsmedicine.org\/) [Health Home](https:\/\/www.hopkinsmedicine.org\/health) [Conditions and Diseases](https:\/\/www.hopkinsmedicine.org\/health\/conditions-and-diseases)\n\n![Covid virus particles with spike proteins](https:\/\/www.hopkinsmedicine.org\/-\/media\/images\/health\/1_-conditions\/coronavirus\/covid-virus-hero.jpg?h=500&iar=0&mh=500&mw=1300&w=1297&hash=F0EA858C6E0DD6AE700EAFB87B153A3F)\n\n![Covid virus particles with spike proteins](https:\/\/www.hopkinsmedicine.org\/-\/media\/images\/health\/1_-conditions\/coronavirus\/covid-virus-hero.jpg?h=500&iar=0&mh=500&mw=1300&w=1297&hash=F0EA858C6E0DD6AE700EAFB87B153A3F)\n\n![Covid virus particles with spike proteins](https:\/\/www.hopkinsmedicine.org\/-\/media\/images\/health\/1_-conditions\/coronavirus\/covid-virus-hero.jpg?h=500&iar=0&mh=500&mw=1300&w=1297&hash=F0EA858C6E0DD6AE700EAFB87B153A3F)\n\n# COVID-19\n\n## COVID-19 is the disease caused by SARS-CoV-2, the coronavirus that emerged in December 2019. Learn about symptoms, diagnosis, treatment and prevention.\n[What is COVID-19?](https:\/\/www.hopkinsmedicine.org\/health\/conditions-and-diseases\/coronavirus#overview)  \\| [Symptoms](https:\/\/www.hopkinsmedicine.org\/health\/conditions-and-diseases\/coronavirus#symptoms) \\| [Spread](https:\/\/www.hopkinsmedicine.org\/health\/conditions-and-diseases\/coronavirus#spread) \\| [Diagnosis](https:\/\/www.hopkinsmedicine.org\/health\/conditions-and-diseases\/coronavirus#diagnosis) \\| [Treatment](https:\/\/www.hopkinsmedicine.org\/health\/conditions-and-diseases\/coronavirus#treatment) \\| [Variants](https:\/\/www.hopkinsmedicine.org\/health\/conditions-and-diseases\/coronavirus#variants) \\| [Research](https:\/\/www.hopkinsmedicine.org\/health\/conditions-and-diseases\/coronavirus#research)\n\n## What is COVID-19?\nCOVID-19 is the disease caused by SARS-CoV-2, the coronavirus that emerged in December 2019.\n\nCoronaviruses are a type of virus. There are many different kinds, and some, like COVID-19, cause disease and sometimes death.\n\n## What You Need to Know\n- COVID-19 can be severe, and has caused millions of deaths around the world as well as lasting health problems in some who have survived the illness.\n- However, some with COVID-19 develop only mild symptoms—or experience no symptoms at all.\n- The best way to protect yourself is to get vaccinated, wash your hands, and follow respiratory etiquette. If you think you may have COVID-19, follow testing guidelines, wear a mask, and practice physical distancing.\n\n## What are symptoms of COVID-19?\nCOVID-19 symptoms include:\n\n- Cough\n- Fever or chills\n- Shortness of breath or difficulty breathing\n- Muscle or body aches\n- Sore throat\n- New loss of taste or smell\n- Diarrhea\n- Headache\n- New fatigue\n- Nausea or vomiting\n- Congestion or runny nose\n\nSome people infected with COVID-19 have mild illness, and others have no symptoms at all. In some cases, however, COVID-19 can lead to respiratory failure, lasting lung and heart muscle damage, nervous system problems, kidney failure or death.\n\nIf you have a fever or any of the symptoms listed above, call your doctor or a health care provider and explain your symptoms over the phone before going to the doctor’s office, urgent care facility or emergency room.\n\n**CALL 911 if you have a medical emergency such as severe shortness of breath or difficulty breathing.**\n\n## How long do COVID-19 symptoms last?\nActive illness can last one to two weeks if you have mild or moderate coronavirus disease, but severe cases can last months. Some people are asymptomatic, meaning they never have symptoms but do have COVID-19.\n\nPost-COVID-19 symptoms, such as lingering cough, on and off fever, weakness, and changes to your senses of smell or taste, can persist for weeks or even months after you recover from acute illness. Persistent symptoms are sometimes known as [long COVID-19](https:\/\/www.hopkinsmedicine.org\/health\/conditions-and-diseases\/coronavirus\/covid-long-haulers-long-term-effects-of-covid19).\n\n## How does COVID-19 spread?\nCOVID-19 is spread through droplets and virus particles released into the air when an infected person breathes, talks, laughs, sings, coughs or sneezes.\n\nLarger droplets may fall to the ground in a few seconds, but tiny infectious particles can linger in the air and accumulate in indoor places, especially where many people are gathered and there is poor ventilation. This is why mask-wearing, hand hygiene and isolation practices for people infected with COVID-19 are essential to preventing COVID-19 transmission.\n\n## What is the incubation period for COVID-19?\nSymptoms show up in people within two to 14 days of exposure to the virus. A person infected with COVID-19 is contagious to others for up to two days before symptoms appear, and they remain contagious to others for 10 to 20 days, depending upon their immune system and the severity of their illness.\n\n## How is COVID-19 diagnosed?\nCOVID-19 is diagnosed through a test. Diagnosis by examination alone is difficult since many COVID-19 signs and symptoms can be caused by other illnesses. Some people do not have symptoms at all.\n\nThere are two basic types of tests for COVID-19.\n\n**Viral test:** This test can tell you if you are **currently infected** with the coronavirus. A swab is placed in the nose or mouth to gather samples. There are two types of viral tests: laboratory tests (sometimes called polymerase chain reaction \\[PCR\\] tests), and rapid tests that detect portions of the virus called antigens.\n\n- *Laboratory coronavirus tests*are given by health care professionals, and results may take a day or more to receive. Since the samples are analyzed in a laboratory, they are very accurate and are often recommended for people with COVID-19 symptoms.\n- *Rapid antigen tests*may be performed in pharmacies or health care facilities, or as self-tests at home. Rapid tests provide results in about 15 minutes. These tests are recommended if you do not have symptoms or if you are taking the test as a risk-prevention measure, such as before going on a work trip or seeing a friend, and you want to be sure you don’t have the coronavirus that causes COVID-19.\n\n**Antibody test:** This is a blood test that can show if you were **previously exposed** to or infected with the virus that causes COVID-19, and if your body has created antibodies in an attempt to defend itself. It takes at least 12 days after exposure for your body to make enough antibodies to show up on a test. Antibody tests are not recommended to determine if you currently have COVID-19.\n\nThis test helps scientists gather data about how the immune system fights off COVID-19 in recovered patients. A positive antibody test means the person has some level of immune protection either from prior infection or from vaccination, but it is not a guarantee of protection from getting re-infected with the virus. Antibody levels decrease over time, and it is not clear how long antibody protection lasts.\n\n## COVID-19 and MIS-C: Tyona's Story\n![](https:\/\/www.hopkinsmedicine.org\/-\/media\/images\/health\/1_-conditions\/coronavirus\/tyona-story.jpg?h=286&iar=0&mh=300&mw=500&w=500&hash=905B06CDD56F3A76AABF0A97AC377B8D)\n\nCOVID-19 and a related inflammatory disorder was hardly the gift this Baltimore teen wished for on her 18th birthday. Read more about her care in the pediatric intensive care unit at Johns Hopkins Children’s Center.\n\n[Read her story](https:\/\/www.hopkinsmedicine.org\/health\/conditions-and-diseases\/coronavirus\/covid-19-and-mis-c-tyonas-story)\n\n## What are risk factors for COVID-19?\nAnyone can catch COVID-19, but some people are at higher risk for serious infection. They include people age 65 and older, women who are pregnant and people with certain illnesses. COVID-19 vaccines (and additional doses when appropriate) are especially recommended for people in these groups.\n\n## How is COVID-19 treated?\nTreatment for COVID-19 depends on the severity of the infection. For milder illness, resting at home and taking medicine to reduce fever is often sufficient. More severe cases may require hospitalization, with treatment that might include intravenous medications, supplemental oxygen, assisted ventilation and other supportive measures\n\n## How do you protect yourself from COVID-19?\nThere are several COVID-19 vaccines recommended by the CDC. [Learn more about the COVID-19 vaccine](https:\/\/www.hopkinsmedicine.org\/health\/conditions-and-diseases\/coronavirus\/covid-19-vaccine-what-you-need-to-know).\n\nIn addition, it helps to keep up with other safety precautions, such as following testing guidelines, wearing a mask, washing your hands and staying at home when you are sick.\n\n## Are there different variants of COVID-19?\nYes, there are different variants of this coronavirus. Like other viruses, the coronavirus that causes COVID-19 can change (mutate). Mutations may enable the coronavirus to spread faster from person to person. More infections can result in more people getting very sick and also create more opportunity for the virus to develop further mutations.\n\n## COVID-19 Research at Johns Hopkins\nExperts at Johns Hopkins are continuing to investigate COVID-19 causes, treatment, impact and prevention.\n\n[COVID-19 Research](https:\/\/www.hopkinsmedicine.org\/news\/newsroom\/news-releases?q=covid&count=10)\n\n## Related Articles\n- [![](https:\/\/www.hopkinsmedicine.org\/-\/media\/images\/health\/1_-conditions\/coronavirus\/vaccine-teaser.jpg?mw=260&mh=155&hash=17679740A16D4F63122AC5484E31736B) Coronavirus COVID-19 Vaccine: What You Need to Know](https:\/\/www.hopkinsmedicine.org\/health\/conditions-and-diseases\/coronavirus\/covid-19-vaccine-what-you-need-to-know)\n- [![](https:\/\/www.hopkinsmedicine.org\/-\/media\/images\/health\/1_-conditions\/coronavirus\/covid-long-haulers-teaser.jpg?mw=260&mh=155&hash=40C064958D0A560049516991A071C345) Infectious Diseases Long COVID: Long-Term Effects of COVID-19](https:\/\/www.hopkinsmedicine.org\/health\/conditions-and-diseases\/coronavirus\/covid-long-haulers-long-term-effects-of-covid19)\n\n## [![Johns Hopkins Medicine](https:\/\/www.hopkinsmedicine.org\/-\/media\/images\/hopkins-nav-logo.svg)](https:\/\/www.hopkinsmedicine.org\/)\nLanguage Assistance Available:\n\n- [Español](https:\/\/www.hopkinsmedicine.org\/patient-care\/patients-visitors\/language-assistance-services#spanish)\n- [አማርኛ](https:\/\/www.hopkinsmedicine.org\/patient-care\/patients-visitors\/language-assistance-services#amharic)\n- [繁體中文](https:\/\/www.hopkinsmedicine.org\/patient-care\/patients-visitors\/language-assistance-services#chinese)\n- [Français](https:\/\/www.hopkinsmedicine.org\/patient-care\/patients-visitors\/language-assistance-services#french)\n- [Tagalog](https:\/\/www.hopkinsmedicine.org\/patient-care\/patients-visitors\/language-assistance-services#tagalog)\n- 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All rights reserved.","attrs_readable_markdown":"## COVID-19 is the disease caused by SARS-CoV-2, the coronavirus that emerged in December 2019. Learn about symptoms, diagnosis, treatment and prevention.\n## What is COVID-19?\nCOVID-19 is the disease caused by SARS-CoV-2, the coronavirus that emerged in December 2019.\n\nCoronaviruses are a type of virus. There are many different kinds, and some, like COVID-19, cause disease and sometimes death.\n\n## What You Need to Know\n- COVID-19 can be severe, and has caused millions of deaths around the world as well as lasting health problems in some who have survived the illness.\n- However, some with COVID-19 develop only mild symptoms—or experience no symptoms at all.\n- The best way to protect yourself is to get vaccinated, wash your hands, and follow respiratory etiquette. If you think you may have COVID-19, follow testing guidelines, wear a mask, and practice physical distancing.\n\n## What are symptoms of COVID-19?\nCOVID-19 symptoms include:\n\n- Cough\n- Fever or chills\n- Shortness of breath or difficulty breathing\n- Muscle or body aches\n- Sore throat\n- New loss of taste or smell\n- Diarrhea\n- Headache\n- New fatigue\n- Nausea or vomiting\n- Congestion or runny nose\n\nSome people infected with COVID-19 have mild illness, and others have no symptoms at all. In some cases, however, COVID-19 can lead to respiratory failure, lasting lung and heart muscle damage, nervous system problems, kidney failure or death.\n\nIf you have a fever or any of the symptoms listed above, call your doctor or a health care provider and explain your symptoms over the phone before going to the doctor’s office, urgent care facility or emergency room.\n\n**CALL 911 if you have a medical emergency such as severe shortness of breath or difficulty breathing.**\n\n## How long do COVID-19 symptoms last?\nActive illness can last one to two weeks if you have mild or moderate coronavirus disease, but severe cases can last months. Some people are asymptomatic, meaning they never have symptoms but do have COVID-19.\n\nPost-COVID-19 symptoms, such as lingering cough, on and off fever, weakness, and changes to your senses of smell or taste, can persist for weeks or even months after you recover from acute illness. Persistent symptoms are sometimes known as [long COVID-19](https:\/\/www.hopkinsmedicine.org\/health\/conditions-and-diseases\/coronavirus\/covid-long-haulers-long-term-effects-of-covid19).\n\n## How does COVID-19 spread?\nCOVID-19 is spread through droplets and virus particles released into the air when an infected person breathes, talks, laughs, sings, coughs or sneezes.\n\nLarger droplets may fall to the ground in a few seconds, but tiny infectious particles can linger in the air and accumulate in indoor places, especially where many people are gathered and there is poor ventilation. This is why mask-wearing, hand hygiene and isolation practices for people infected with COVID-19 are essential to preventing COVID-19 transmission.\n\n## What is the incubation period for COVID-19?\nSymptoms show up in people within two to 14 days of exposure to the virus. A person infected with COVID-19 is contagious to others for up to two days before symptoms appear, and they remain contagious to others for 10 to 20 days, depending upon their immune system and the severity of their illness.\n\n## How is COVID-19 diagnosed?\nCOVID-19 is diagnosed through a test. Diagnosis by examination alone is difficult since many COVID-19 signs and symptoms can be caused by other illnesses. Some people do not have symptoms at all.\n\nThere are two basic types of tests for COVID-19.\n\n**Viral test:** This test can tell you if you are **currently infected** with the coronavirus. A swab is placed in the nose or mouth to gather samples. There are two types of viral tests: laboratory tests (sometimes called polymerase chain reaction \\[PCR\\] tests), and rapid tests that detect portions of the virus called antigens.\n\n- *Laboratory coronavirus tests*are given by health care professionals, and results may take a day or more to receive. Since the samples are analyzed in a laboratory, they are very accurate and are often recommended for people with COVID-19 symptoms.\n- *Rapid antigen tests*may be performed in pharmacies or health care facilities, or as self-tests at home. Rapid tests provide results in about 15 minutes. These tests are recommended if you do not have symptoms or if you are taking the test as a risk-prevention measure, such as before going on a work trip or seeing a friend, and you want to be sure you don’t have the coronavirus that causes COVID-19.\n\n**Antibody test:** This is a blood test that can show if you were **previously exposed** to or infected with the virus that causes COVID-19, and if your body has created antibodies in an attempt to defend itself. It takes at least 12 days after exposure for your body to make enough antibodies to show up on a test. Antibody tests are not recommended to determine if you currently have COVID-19.\n\nThis test helps scientists gather data about how the immune system fights off COVID-19 in recovered patients. A positive antibody test means the person has some level of immune protection either from prior infection or from vaccination, but it is not a guarantee of protection from getting re-infected with the virus. Antibody levels decrease over time, and it is not clear how long antibody protection lasts.\n\n## COVID-19 and MIS-C: Tyona's Story\n![](https:\/\/www.hopkinsmedicine.org\/-\/media\/images\/health\/1_-conditions\/coronavirus\/tyona-story.jpg?h=286&iar=0&mh=300&mw=500&w=500&hash=905B06CDD56F3A76AABF0A97AC377B8D)\n\nCOVID-19 and a related inflammatory disorder was hardly the gift this Baltimore teen wished for on her 18th birthday. Read more about her care in the pediatric intensive care unit at Johns Hopkins Children’s Center.\n\n## What are risk factors for COVID-19?\nAnyone can catch COVID-19, but some people are at higher risk for serious infection. They include people age 65 and older, women who are pregnant and people with certain illnesses. COVID-19 vaccines (and additional doses when appropriate) are especially recommended for people in these groups.\n\n## How is COVID-19 treated?\nTreatment for COVID-19 depends on the severity of the infection. For milder illness, resting at home and taking medicine to reduce fever is often sufficient. More severe cases may require hospitalization, with treatment that might include intravenous medications, supplemental oxygen, assisted ventilation and other supportive measures\n\n## How do you protect yourself from COVID-19?\nThere are several COVID-19 vaccines recommended by the CDC. [Learn more about the COVID-19 vaccine](https:\/\/www.hopkinsmedicine.org\/health\/conditions-and-diseases\/coronavirus\/covid-19-vaccine-what-you-need-to-know).\n\nIn addition, it helps to keep up with other safety precautions, such as following testing guidelines, wearing a mask, washing your hands and staying at home when you are sick.\n\n## Are there different variants of COVID-19?\nYes, there are different variants of this coronavirus. Like other viruses, the coronavirus that causes COVID-19 can change (mutate). Mutations may enable the coronavirus to spread faster from person to person. 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COVID-19 | Johns Hopkins Medicine

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COVID-19 is the disease caused by SARS-CoV-2, the coronavirus that emerged in December 2019. Learn about symptoms, diagnosis, treatment and prevention.

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COVID-19 is the disease caused by SARS-CoV-2, the coronavirus that emerged in December 2019. Learn about symptoms, diagnosis, treatment and prevention. What is COVID-19? COVID-19 is the disease caused by SARS-CoV-2, the coronavirus that emerged in December 2019. Coronaviruses are a type of virus. There are many different kinds, and some, like COVID-19, cause disease and sometimes death. What You Need to Know COVID-19 can be severe, and has caused millions of deaths around the world as well as lasting health problems in some who have survived the illness. However, some with COVID-19 develop only mild symptoms—or experience no symptoms at all. The best way to protect yourself is to get vaccinated, wash your hands, and follow respiratory etiquette. If you think you may have COVID-19, follow testing guidelines, wear a mask, and practice physical distancing. What are symptoms of COVID-19? COVID-19 symptoms include: Cough Fever or chills Shortness of breath or difficulty breathing Muscle or body aches Sore throat New loss of taste or smell Diarrhea Headache New fatigue Nausea or vomiting Congestion or runny nose Some people infected with COVID-19 have mild illness, and others have no symptoms at all. In some cases, however, COVID-19 can lead to respiratory failure, lasting lung and heart muscle damage, nervous system problems, kidney failure or death. If you have a fever or any of the symptoms listed above, call your doctor or a health care provider and explain your symptoms over the phone before going to the doctor’s office, urgent care facility or emergency room. CALL 911 if you have a medical emergency such as severe shortness of breath or difficulty breathing. How long do COVID-19 symptoms last? Active illness can last one to two weeks if you have mild or moderate coronavirus disease, but severe cases can last months. Some people are asymptomatic, meaning they never have symptoms but do have COVID-19. Post-COVID-19 symptoms, such as lingering cough, on and off fever, weakness, and changes to your senses of smell or taste, can persist for weeks or even months after you recover from acute illness. Persistent symptoms are sometimes known as long COVID-19 . How does COVID-19 spread? COVID-19 is spread through droplets and virus particles released into the air when an infected person breathes, talks, laughs, sings, coughs or sneezes. Larger droplets may fall to the ground in a few seconds, but tiny infectious particles can linger in the air and accumulate in indoor places, especially where many people are gathered and there is poor ventilation. This is why mask-wearing, hand hygiene and isolation practices for people infected with COVID-19 are essential to preventing COVID-19 transmission. What is the incubation period for COVID-19? Symptoms show up in people within two to 14 days of exposure to the virus. A person infected with COVID-19 is contagious to others for up to two days before symptoms appear, and they remain contagious to others for 10 to 20 days, depending upon their immune system and the severity of their illness. How is COVID-19 diagnosed? COVID-19 is diagnosed through a test. Diagnosis by examination alone is difficult since many COVID-19 signs and symptoms can be caused by other illnesses. Some people do not have symptoms at all. There are two basic types of tests for COVID-19. Viral test: This test can tell you if you are currently infected with the coronavirus. A swab is placed in the nose or mouth to gather samples. There are two types of viral tests: laboratory tests (sometimes called polymerase chain reaction [PCR] tests), and rapid tests that detect portions of the virus called antigens. Laboratory coronavirus tests are given by health care professionals, and results may take a day or more to receive. Since the samples are analyzed in a laboratory, they are very accurate and are often recommended for people with COVID-19 symptoms. Rapid antigen tests may be performed in pharmacies or health care facilities, or as self-tests at home. Rapid tests provide results in about 15 minutes. These tests are recommended if you do not have symptoms or if you are taking the test as a risk-prevention measure, such as before going on a work trip or seeing a friend, and you want to be sure you don’t have the coronavirus that causes COVID-19. Antibody test: This is a blood test that can show if you were previously exposed to or infected with the virus that causes COVID-19, and if your body has created antibodies in an attempt to defend itself. It takes at least 12 days after exposure for your body to make enough antibodies to show up on a test. Antibody tests are not recommended to determine if you currently have COVID-19. This test helps scientists gather data about how the immune system fights off COVID-19 in recovered patients. A positive antibody test means the person has some level of immune protection either from prior infection or from vaccination, but it is not a guarantee of protection from getting re-infected with the virus. Antibody levels decrease over time, and it is not clear how long antibody protection lasts. COVID-19 and MIS-C: Tyona's Story COVID-19 and a related inflammatory disorder was hardly the gift this Baltimore teen wished for on her 18th birthday. Read more about her care in the pediatric intensive care unit at Johns Hopkins Children’s Center. What are risk factors for COVID-19? Anyone can catch COVID-19, but some people are at higher risk for serious infection. They include people age 65 and older, women who are pregnant and people with certain illnesses. COVID-19 vaccines (and additional doses when appropriate) are especially recommended for people in these groups. How is COVID-19 treated? Treatment for COVID-19 depends on the severity of the infection. For milder illness, resting at home and taking medicine to reduce fever is often sufficient. More severe cases may require hospitalization, with treatment that might include intravenous medications, supplemental oxygen, assisted ventilation and other supportive measures How do you protect yourself from COVID-19? There are several COVID-19 vaccines recommended by the CDC. Learn more about the COVID-19 vaccine . In addition, it helps to keep up with other safety precautions, such as following testing guidelines, wearing a mask, washing your hands and staying at home when you are sick. Are there different variants of COVID-19? Yes, there are different variants of this coronavirus. Like other viruses, the coronavirus that causes COVID-19 can change (mutate). Mutations may enable the coronavirus to spread faster from person to person. More infections can result in more people getting very sick and also create more opportunity for the virus to develop further mutations. COVID-19 Research at Johns Hopkins Experts at Johns Hopkins are continuing to investigate COVID-19 causes, treatment, impact and prevention.

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[Skip to Main Content](https://www.hopkinsmedicine.org/health/conditions-and-diseases/coronavirus#skip) [![Johns Hopkins Medicine](https://www.hopkinsmedicine.org/-/media/images/hopkins-medicine-logo-white-header.svg?iar=0&hash=C6173D209DB591FDF4EFE00B18C2FFE4)](https://www.hopkinsmedicine.org/) Johns Hopkins Medicine Menu - [Health](https://www.hopkinsmedicine.org/health) - [School of Medicine](https://www.hopkinsmedicine.org/som) - [Johns Hopkins Medicine Home](https://www.hopkinsmedicine.org/) - [About](https://www.hopkinsmedicine.org/about) - [Patient Care](https://www.hopkinsmedicine.org/patient-care) - [Research](https://www.hopkinsmedicine.org/research) - [MyChart](https://mychart.hopkinsmedicine.org/) - [Schedule an Appointment](https://www.hopkinsmedicine.org/patient-care/johns-hopkins-medicine-request-appointment) - [Find a Doctor](https://www.hopkinsmedicine.org/profiles) - [Find a Clinical Trial](https://www.hopkinsmedicine.org/clinical-trials) - [Pay Your Bill](https://www.hopkinsmedicine.org/patient-care/patients-visitors/billing-insurance/pay-bill) - [Employment](https://www.hopkinsmedicine.org/employment) Close Search Close [MyChart Login MyChart](https://mychart.hopkinsmedicine.org/) [Home](https://www.hopkinsmedicine.org/) [Health Home](https://www.hopkinsmedicine.org/health) [Conditions and Diseases](https://www.hopkinsmedicine.org/health/conditions-and-diseases) ![Covid virus particles with spike proteins](https://www.hopkinsmedicine.org/-/media/images/health/1_-conditions/coronavirus/covid-virus-hero.jpg?h=500&iar=0&mh=500&mw=1300&w=1297&hash=F0EA858C6E0DD6AE700EAFB87B153A3F) ![Covid virus particles with spike proteins](https://www.hopkinsmedicine.org/-/media/images/health/1_-conditions/coronavirus/covid-virus-hero.jpg?h=500&iar=0&mh=500&mw=1300&w=1297&hash=F0EA858C6E0DD6AE700EAFB87B153A3F) ![Covid virus particles with spike proteins](https://www.hopkinsmedicine.org/-/media/images/health/1_-conditions/coronavirus/covid-virus-hero.jpg?h=500&iar=0&mh=500&mw=1300&w=1297&hash=F0EA858C6E0DD6AE700EAFB87B153A3F) # COVID-19 ## COVID-19 is the disease caused by SARS-CoV-2, the coronavirus that emerged in December 2019. Learn about symptoms, diagnosis, treatment and prevention. [What is COVID-19?](https://www.hopkinsmedicine.org/health/conditions-and-diseases/coronavirus#overview) \| [Symptoms](https://www.hopkinsmedicine.org/health/conditions-and-diseases/coronavirus#symptoms) \| [Spread](https://www.hopkinsmedicine.org/health/conditions-and-diseases/coronavirus#spread) \| [Diagnosis](https://www.hopkinsmedicine.org/health/conditions-and-diseases/coronavirus#diagnosis) \| [Treatment](https://www.hopkinsmedicine.org/health/conditions-and-diseases/coronavirus#treatment) \| [Variants](https://www.hopkinsmedicine.org/health/conditions-and-diseases/coronavirus#variants) \| [Research](https://www.hopkinsmedicine.org/health/conditions-and-diseases/coronavirus#research) ## What is COVID-19? COVID-19 is the disease caused by SARS-CoV-2, the coronavirus that emerged in December 2019. Coronaviruses are a type of virus. There are many different kinds, and some, like COVID-19, cause disease and sometimes death. ## What You Need to Know - COVID-19 can be severe, and has caused millions of deaths around the world as well as lasting health problems in some who have survived the illness. - However, some with COVID-19 develop only mild symptoms—or experience no symptoms at all. - The best way to protect yourself is to get vaccinated, wash your hands, and follow respiratory etiquette. If you think you may have COVID-19, follow testing guidelines, wear a mask, and practice physical distancing. ## What are symptoms of COVID-19? COVID-19 symptoms include: - Cough - Fever or chills - Shortness of breath or difficulty breathing - Muscle or body aches - Sore throat - New loss of taste or smell - Diarrhea - Headache - New fatigue - Nausea or vomiting - Congestion or runny nose Some people infected with COVID-19 have mild illness, and others have no symptoms at all. In some cases, however, COVID-19 can lead to respiratory failure, lasting lung and heart muscle damage, nervous system problems, kidney failure or death. If you have a fever or any of the symptoms listed above, call your doctor or a health care provider and explain your symptoms over the phone before going to the doctor’s office, urgent care facility or emergency room. **CALL 911 if you have a medical emergency such as severe shortness of breath or difficulty breathing.** ## How long do COVID-19 symptoms last? Active illness can last one to two weeks if you have mild or moderate coronavirus disease, but severe cases can last months. Some people are asymptomatic, meaning they never have symptoms but do have COVID-19. Post-COVID-19 symptoms, such as lingering cough, on and off fever, weakness, and changes to your senses of smell or taste, can persist for weeks or even months after you recover from acute illness. Persistent symptoms are sometimes known as [long COVID-19](https://www.hopkinsmedicine.org/health/conditions-and-diseases/coronavirus/covid-long-haulers-long-term-effects-of-covid19). ## How does COVID-19 spread? COVID-19 is spread through droplets and virus particles released into the air when an infected person breathes, talks, laughs, sings, coughs or sneezes. Larger droplets may fall to the ground in a few seconds, but tiny infectious particles can linger in the air and accumulate in indoor places, especially where many people are gathered and there is poor ventilation. This is why mask-wearing, hand hygiene and isolation practices for people infected with COVID-19 are essential to preventing COVID-19 transmission. ## What is the incubation period for COVID-19? Symptoms show up in people within two to 14 days of exposure to the virus. A person infected with COVID-19 is contagious to others for up to two days before symptoms appear, and they remain contagious to others for 10 to 20 days, depending upon their immune system and the severity of their illness. ## How is COVID-19 diagnosed? COVID-19 is diagnosed through a test. Diagnosis by examination alone is difficult since many COVID-19 signs and symptoms can be caused by other illnesses. Some people do not have symptoms at all. There are two basic types of tests for COVID-19. **Viral test:** This test can tell you if you are **currently infected** with the coronavirus. A swab is placed in the nose or mouth to gather samples. There are two types of viral tests: laboratory tests (sometimes called polymerase chain reaction \[PCR\] tests), and rapid tests that detect portions of the virus called antigens. - *Laboratory coronavirus tests*are given by health care professionals, and results may take a day or more to receive. Since the samples are analyzed in a laboratory, they are very accurate and are often recommended for people with COVID-19 symptoms. - *Rapid antigen tests*may be performed in pharmacies or health care facilities, or as self-tests at home. Rapid tests provide results in about 15 minutes. These tests are recommended if you do not have symptoms or if you are taking the test as a risk-prevention measure, such as before going on a work trip or seeing a friend, and you want to be sure you don’t have the coronavirus that causes COVID-19. **Antibody test:** This is a blood test that can show if you were **previously exposed** to or infected with the virus that causes COVID-19, and if your body has created antibodies in an attempt to defend itself. It takes at least 12 days after exposure for your body to make enough antibodies to show up on a test. Antibody tests are not recommended to determine if you currently have COVID-19. This test helps scientists gather data about how the immune system fights off COVID-19 in recovered patients. A positive antibody test means the person has some level of immune protection either from prior infection or from vaccination, but it is not a guarantee of protection from getting re-infected with the virus. Antibody levels decrease over time, and it is not clear how long antibody protection lasts. ## COVID-19 and MIS-C: Tyona's Story ![](https://www.hopkinsmedicine.org/-/media/images/health/1_-conditions/coronavirus/tyona-story.jpg?h=286&iar=0&mh=300&mw=500&w=500&hash=905B06CDD56F3A76AABF0A97AC377B8D) COVID-19 and a related inflammatory disorder was hardly the gift this Baltimore teen wished for on her 18th birthday. Read more about her care in the pediatric intensive care unit at Johns Hopkins Children’s Center. [Read her story](https://www.hopkinsmedicine.org/health/conditions-and-diseases/coronavirus/covid-19-and-mis-c-tyonas-story) ## What are risk factors for COVID-19? Anyone can catch COVID-19, but some people are at higher risk for serious infection. They include people age 65 and older, women who are pregnant and people with certain illnesses. COVID-19 vaccines (and additional doses when appropriate) are especially recommended for people in these groups. ## How is COVID-19 treated? Treatment for COVID-19 depends on the severity of the infection. For milder illness, resting at home and taking medicine to reduce fever is often sufficient. More severe cases may require hospitalization, with treatment that might include intravenous medications, supplemental oxygen, assisted ventilation and other supportive measures ## How do you protect yourself from COVID-19? There are several COVID-19 vaccines recommended by the CDC. [Learn more about the COVID-19 vaccine](https://www.hopkinsmedicine.org/health/conditions-and-diseases/coronavirus/covid-19-vaccine-what-you-need-to-know). In addition, it helps to keep up with other safety precautions, such as following testing guidelines, wearing a mask, washing your hands and staying at home when you are sick. ## Are there different variants of COVID-19? Yes, there are different variants of this coronavirus. Like other viruses, the coronavirus that causes COVID-19 can change (mutate). Mutations may enable the coronavirus to spread faster from person to person. More infections can result in more people getting very sick and also create more opportunity for the virus to develop further mutations. ## COVID-19 Research at Johns Hopkins Experts at Johns Hopkins are continuing to investigate COVID-19 causes, treatment, impact and prevention. [COVID-19 Research](https://www.hopkinsmedicine.org/news/newsroom/news-releases?q=covid&count=10) ## Related Articles - [![](https://www.hopkinsmedicine.org/-/media/images/health/1_-conditions/coronavirus/vaccine-teaser.jpg?mw=260&mh=155&hash=17679740A16D4F63122AC5484E31736B) Coronavirus COVID-19 Vaccine: What You Need to Know](https://www.hopkinsmedicine.org/health/conditions-and-diseases/coronavirus/covid-19-vaccine-what-you-need-to-know) - [![](https://www.hopkinsmedicine.org/-/media/images/health/1_-conditions/coronavirus/covid-long-haulers-teaser.jpg?mw=260&mh=155&hash=40C064958D0A560049516991A071C345) Infectious Diseases Long COVID: Long-Term Effects of COVID-19](https://www.hopkinsmedicine.org/health/conditions-and-diseases/coronavirus/covid-long-haulers-long-term-effects-of-covid19) ## [![Johns Hopkins Medicine](https://www.hopkinsmedicine.org/-/media/images/hopkins-nav-logo.svg)](https://www.hopkinsmedicine.org/) Language Assistance Available: - [Español](https://www.hopkinsmedicine.org/patient-care/patients-visitors/language-assistance-services#spanish) - 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## COVID-19 is the disease caused by SARS-CoV-2, the coronavirus that emerged in December 2019. Learn about symptoms, diagnosis, treatment and prevention. ## What is COVID-19? COVID-19 is the disease caused by SARS-CoV-2, the coronavirus that emerged in December 2019. Coronaviruses are a type of virus. There are many different kinds, and some, like COVID-19, cause disease and sometimes death. ## What You Need to Know - COVID-19 can be severe, and has caused millions of deaths around the world as well as lasting health problems in some who have survived the illness. - However, some with COVID-19 develop only mild symptoms—or experience no symptoms at all. - The best way to protect yourself is to get vaccinated, wash your hands, and follow respiratory etiquette. If you think you may have COVID-19, follow testing guidelines, wear a mask, and practice physical distancing. ## What are symptoms of COVID-19? COVID-19 symptoms include: - Cough - Fever or chills - Shortness of breath or difficulty breathing - Muscle or body aches - Sore throat - New loss of taste or smell - Diarrhea - Headache - New fatigue - Nausea or vomiting - Congestion or runny nose Some people infected with COVID-19 have mild illness, and others have no symptoms at all. In some cases, however, COVID-19 can lead to respiratory failure, lasting lung and heart muscle damage, nervous system problems, kidney failure or death. If you have a fever or any of the symptoms listed above, call your doctor or a health care provider and explain your symptoms over the phone before going to the doctor’s office, urgent care facility or emergency room. **CALL 911 if you have a medical emergency such as severe shortness of breath or difficulty breathing.** ## How long do COVID-19 symptoms last? Active illness can last one to two weeks if you have mild or moderate coronavirus disease, but severe cases can last months. Some people are asymptomatic, meaning they never have symptoms but do have COVID-19. Post-COVID-19 symptoms, such as lingering cough, on and off fever, weakness, and changes to your senses of smell or taste, can persist for weeks or even months after you recover from acute illness. Persistent symptoms are sometimes known as [long COVID-19](https://www.hopkinsmedicine.org/health/conditions-and-diseases/coronavirus/covid-long-haulers-long-term-effects-of-covid19). ## How does COVID-19 spread? COVID-19 is spread through droplets and virus particles released into the air when an infected person breathes, talks, laughs, sings, coughs or sneezes. Larger droplets may fall to the ground in a few seconds, but tiny infectious particles can linger in the air and accumulate in indoor places, especially where many people are gathered and there is poor ventilation. This is why mask-wearing, hand hygiene and isolation practices for people infected with COVID-19 are essential to preventing COVID-19 transmission. ## What is the incubation period for COVID-19? Symptoms show up in people within two to 14 days of exposure to the virus. A person infected with COVID-19 is contagious to others for up to two days before symptoms appear, and they remain contagious to others for 10 to 20 days, depending upon their immune system and the severity of their illness. ## How is COVID-19 diagnosed? COVID-19 is diagnosed through a test. Diagnosis by examination alone is difficult since many COVID-19 signs and symptoms can be caused by other illnesses. Some people do not have symptoms at all. There are two basic types of tests for COVID-19. **Viral test:** This test can tell you if you are **currently infected** with the coronavirus. A swab is placed in the nose or mouth to gather samples. There are two types of viral tests: laboratory tests (sometimes called polymerase chain reaction \[PCR\] tests), and rapid tests that detect portions of the virus called antigens. - *Laboratory coronavirus tests*are given by health care professionals, and results may take a day or more to receive. Since the samples are analyzed in a laboratory, they are very accurate and are often recommended for people with COVID-19 symptoms. - *Rapid antigen tests*may be performed in pharmacies or health care facilities, or as self-tests at home. Rapid tests provide results in about 15 minutes. These tests are recommended if you do not have symptoms or if you are taking the test as a risk-prevention measure, such as before going on a work trip or seeing a friend, and you want to be sure you don’t have the coronavirus that causes COVID-19. **Antibody test:** This is a blood test that can show if you were **previously exposed** to or infected with the virus that causes COVID-19, and if your body has created antibodies in an attempt to defend itself. It takes at least 12 days after exposure for your body to make enough antibodies to show up on a test. Antibody tests are not recommended to determine if you currently have COVID-19. This test helps scientists gather data about how the immune system fights off COVID-19 in recovered patients. A positive antibody test means the person has some level of immune protection either from prior infection or from vaccination, but it is not a guarantee of protection from getting re-infected with the virus. Antibody levels decrease over time, and it is not clear how long antibody protection lasts. ## COVID-19 and MIS-C: Tyona's Story ![](https://www.hopkinsmedicine.org/-/media/images/health/1_-conditions/coronavirus/tyona-story.jpg?h=286&iar=0&mh=300&mw=500&w=500&hash=905B06CDD56F3A76AABF0A97AC377B8D) COVID-19 and a related inflammatory disorder was hardly the gift this Baltimore teen wished for on her 18th birthday. Read more about her care in the pediatric intensive care unit at Johns Hopkins Children’s Center. ## What are risk factors for COVID-19? Anyone can catch COVID-19, but some people are at higher risk for serious infection. They include people age 65 and older, women who are pregnant and people with certain illnesses. COVID-19 vaccines (and additional doses when appropriate) are especially recommended for people in these groups. ## How is COVID-19 treated? Treatment for COVID-19 depends on the severity of the infection. For milder illness, resting at home and taking medicine to reduce fever is often sufficient. More severe cases may require hospitalization, with treatment that might include intravenous medications, supplemental oxygen, assisted ventilation and other supportive measures ## How do you protect yourself from COVID-19? There are several COVID-19 vaccines recommended by the CDC. [Learn more about the COVID-19 vaccine](https://www.hopkinsmedicine.org/health/conditions-and-diseases/coronavirus/covid-19-vaccine-what-you-need-to-know). In addition, it helps to keep up with other safety precautions, such as following testing guidelines, wearing a mask, washing your hands and staying at home when you are sick. ## Are there different variants of COVID-19? Yes, there are different variants of this coronavirus. Like other viruses, the coronavirus that causes COVID-19 can change (mutate). Mutations may enable the coronavirus to spread faster from person to person. More infections can result in more people getting very sick and also create more opportunity for the virus to develop further mutations. ## COVID-19 Research at Johns Hopkins Experts at Johns Hopkins are continuing to investigate COVID-19 causes, treatment, impact and prevention.

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