🕷️ Crawler Inspector

URL Lookup

Direct Parameter Lookup

Raw Queries and Responses

1. Shard Calculation

Query:

Response:

Calculated Shard: 159 (from laksa027)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa159.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://www.ynhhs.org/patient-care/covid-19/Vaccine/booster\')), getAhrefsUnparsedNoserviceFromURL(\'https://www.ynhhs.org/patient-care/covid-19/Vaccine/booster\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/www.ynhhs.org\/patient-care\/covid-19\/Vaccine\/booster","crawl_time":1772876392,"first_indexed_time":1632525375,"http_code":200,"src_unparsed":"org,ynhhs!www,\/patient-care\/covid-19\/Vaccine\/booster s443","src_root_hash":"8056017582372743959","history_drop_reason":null,"meta_title":"Booster or Third Dose?","meta_descriptions":["CDC recommends everyone stay up to date with COVID-19 vaccines for their age group."],"attrs_boilerpipe_text":"A “third dose” of an mRNA vaccine is available to people who may not have had a strong enough immune response after receiving the first two doses. For example, those who are immunocompromised need a third dose to reach a stronger level of immunity against the virus. \nA “booster” is an additional vaccine dose given to individuals who may have waning immunity because they completed their initial vaccine series many months ago.\nA third dose of the Pfizer or Moderna vaccine is available for people with certain immunocompromised conditions including current treatment for cancer, those who received an organ transplant or those with advanced or untreated HIV.\nVisit the Centers for Disease Control and Prevention site for the latest additional dose information for immunocompromised individuals.\nThe CDC now allows for recipients to\n\"mix and match\"\n their booster shot. That means if your first two doses were with the Pfizer vaccine, you can receive a booster dose with the Moderna vaccine. If you received a Johnson & Johnson vaccine, you are eligible to receive a Pfizer or Moderna booster shot.\nI do not have any underlying conditions. Why would I need a booster?\nThe available data shows people who got their initial doses of the vaccine may have waning immunity after a period of time. A booster shot can help boost protection against COVID-19.\nWill I experience the same side effects for this extra dose as I did for my previous shots?\nReactions reported after an additional dose were similar to that of the two-dose series: fatigue and pain at injection site were the most commonly reported side effects, and overall, most symptoms were mild to moderate. However, as with the two-dose series, serious side effects are rare, but may occur.","attrs_markdown":"[Skip to main content](https:\/\/www.ynhhs.org\/patient-care\/covid-19\/Vaccine\/booster#main)\n\n[![Yale New Haven Health logo](https:\/\/www.ynhhs.org\/-\/media\/Images\/Logo\/YNHHS_hor_clr_484x127.ashx?h=127&iar=0&w=484&hash=11E8047061263B1C6342665F74BC888B)](https:\/\/www.ynhhs.org\/)\n\n[Find a Doctor](https:\/\/www.ynhhs.org\/find-a-doctor)[Get Care Now](https:\/\/www.ynhhs.org\/get-care-now)\n\n- Services\n  ### Services\n  #### Featured Specialties\n  - [Aging (Geriatrics)](https:\/\/www.ynhhs.org\/patient-care\/aging \"Aging (Geriatrics)\")\n  - [Cancer (Oncology)](https:\/\/www.ynhhs.org\/patient-care\/Cancer \"Cancer (Oncology)\")\n  - [Children’s (Pediatrics)](https:\/\/www.ynhhs.org\/patient-care\/childrens-pediatrics \"Children’s (Pediatrics)\")\n  - [Digestive Disorders (Gastroenterology)](https:\/\/www.ynhhs.org\/patient-care\/digestive-disorders \"Digestive Disorders (Gastroenterology)\")\n  - [Heart & Vascular](https:\/\/www.ynhhs.org\/patient-care\/heart \"Heart & Vascular\")\n  - [Home Healthcare](https:\/\/www.ynhhs.org\/health-at-home)\n  - [Mental Health (Psychiatry)](https:\/\/www.ynhhs.org\/patient-care\/Mental-Health \"Mental Health (Psychiatry)\")\n  - [Neurology & Neurosurgery](https:\/\/www.ynhhs.org\/patient-care\/neurology-and-neurosurgery \"Neurology & Neurosurgery\")\n  - [Orthopedics](https:\/\/www.ynhhs.org\/patient-care\/orthopedics \"Orthopedics\")\n  - [Primary Care](https:\/\/www.ynhhs.org\/patient-care\/primary-care \"Primary Care\")\n  - [Transplantation](https:\/\/www.ynhhs.org\/patient-care\/Transplantation \"Transplantation\")\n  - [Trauma & Burn](https:\/\/www.ynhhs.org\/patient-care\/trauma-and-burn \"Trauma & Burn\")\n  - [Women’s Health](https:\/\/www.ynhhs.org\/patient-care\/Womens-Health \"Women’s Health\")\n  \n  [View All Services](https:\/\/www.ynhhs.org\/patient-care \"View All Services\")\n  \n  #### More Care\n  - [COVID-19 Resources](https:\/\/www.ynhhs.org\/patient-care\/covid-19 \"COVID-19 Vaccine\")\n  - [For Medical Professionals](https:\/\/www.ynhh.org\/medical-professionals \"For Medical Professionals\")\n  - [Get Care Now](https:\/\/www.ynhhs.org\/get-care-now)\n  - [Pharmacy](https:\/\/www.ynhhs.org\/patient-care\/pharmacy)\n  - [Urgent Care](https:\/\/www.ynhhs.org\/urgent-care \"Urgent Care\")\n- Locations\n  ### Locations\n  #### Location Type\n  - [Ambulatory \/ Outpatient Care](https:\/\/www.ynhhs.org\/find-a-location#sort=relevancy&numberOfResults=25&f:facilitytype=[Outpatient%20Medical%20Centers])\n  - [Blood Draw](https:\/\/www.ynhhs.org\/find-a-location#f:facilitytype=[Blood%20Draw])\n  - [Cancer (Oncology)](https:\/\/www.ynhhs.org\/find-a-location#f:facilitytype=[Cancer%20\\(Oncology\\)])\n  - [Occupational Care](https:\/\/www.ynhhs.org\/find-a-location#f:facilitytype=[Occupational%20Care])\n  - [Primary Care](https:\/\/www.ynhhs.org\/find-a-location#f:facilitytype=[Primary%20Care])\n  - [Radiology](https:\/\/www.ynhhs.org\/find-a-location#f:facilitytype=[Radiology])\n  - [Urgent Care](https:\/\/www.ynhhs.org\/urgent-care)\n  \n  [View All Our Locations](https:\/\/www.ynhhs.org\/find-a-location)\n  \n  #### Hospitals and Multispecialty Locations\n  - [Bridgeport Hospital](https:\/\/www.bridgeporthospital.org\/ \"Bridgeport Hospital\")\n  - [Greenwich Hospital](https:\/\/www.greenwichhospital.org\/ \"Greenwich Hospital\")\n  - [Lawrence + Memorial Hospital](https:\/\/www.lmhospital.org\/)\n  - [Northeast Medical Group](https:\/\/www.northeastmedicalgroup.org\/find-a-doctor \"Northeast Medical Group\")\n  - [Smilow Cancer Hospital at Yale New Haven](https:\/\/www.ynhh.org\/smilow \"Smilow Cancer Hospital at Yale New Haven\")\n  - [Westerly Hospital](https:\/\/www.westerlyhospital.org\/ \"Westerly Hospital\")\n  - [Yale Medicine](https:\/\/www.yalemedicine.org\/ \"Yale Medicine\")\n  - [Yale New Haven Children's Hospital](https:\/\/www.ynhh.org\/childrens-hospital)\n  - [Yale New Haven Hospital](https:\/\/www.ynhh.org\/ \"Yale New Haven Hospital\")\n  - [Yale New Haven Psychiatric Hospital](https:\/\/www.ynhh.org\/psychiatric \"Yale New Haven Psychiatric Hospital\")\n- Patients & Visitors\n  ### Patients & Visitors\n  #### Patients\n  - [Billing & Insurance](https:\/\/www.ynhhs.org\/patient-care\/billing-insurance \"<br\/> Billing & Insurance\")\n  - [Classes & Events](https:\/\/www.ynhhs.org\/events \"Classes & Events\")\n  - [Financial Assistance](https:\/\/www.ynhhs.org\/patient-care\/billing-insurance\/Financial-assistance \"Financial Assistance\")\n  - [Get Care Now](https:\/\/www.ynhhs.org\/get-care-now)\n  - [Language Services](https:\/\/www.ynhhs.org\/patient-care\/language-services)\n  - [News and Media](https:\/\/www.ynhhs.org\/news-media)\n  - [No Surprises Act](https:\/\/www.ynhhs.org\/patient-care\/Patient-Rights-and-Responsibilities\/no-surprise-billing)\n  - [Patient Guidelines](https:\/\/www.ynhhs.org\/patients-visitors\/preparing\/visitor-policy \"Patient Guidelines\")\n  - [Patient Rights and Responsibilities](https:\/\/www.ynhhs.org\/patient-care\/Patient-Rights-and-Responsibilities \"Patient Rights and Responsibilities\")\n  - [Pay Your Bill](https:\/\/mychart.ynhhs.org\/MyChart-PRD\/ \"Pay Your Bill\")\n  \n  [View All Patient & Visitor Information](https:\/\/www.ynhhs.org\/patients-visitors)\n  \n  #### Patient Tools\n  - [Make An Appointment](https:\/\/www.ynhhs.org\/make-an-appointment \"Make An Appointment\")\n  - [Prescription Refills](https:\/\/mychart.ynhhs.org\/ \"Prescription Refills\")\n  - [Request Medical Records](https:\/\/www.ynhhs.org\/online-tools\/Request-Medical-Records \"Request Medical Records\")\n  - [Thank Your Caregiver - ThinkThanks Employee Spotlight](https:\/\/www.ynhhs.org\/employee-spotlight)\n\nExplore Our Health System\n\n- [Yale New Haven Health](https:\/\/www.ynhhs.org\/)\n- [Bridgeport Hospital](https:\/\/www.bridgeporthospital.org\/)\n- [Yale New Haven Children's Hospital](https:\/\/www.ynhh.org\/childrens-hospital)\n- [Greenwich Hospital](https:\/\/www.greenwichhospital.org\/)\n- [Lawrence + Memorial Hospital](https:\/\/www.lmhospital.org\/)\n- [Yale New Haven Psychiatric Hospital](https:\/\/www.ynhh.org\/psychiatric)\n- [Smilow Cancer Hospital](https:\/\/www.ynhh.org\/smilow)\n- [Yale New Haven Health Urgent Care](https:\/\/www.ynhhs.org\/urgent-care)\n- [Westerly Hospital](https:\/\/www.westerlyhospital.org\/)\n- [Yale New Haven Hospital](https:\/\/www.ynhh.org\/)\n- [Clinical Affiliates](https:\/\/www.ynhhs.org\/clinical-affiliates)\n- [Northeast Medical Group](https:\/\/www.northeastmedicalgroup.org\/)\n\n- [Pay a Bill](https:\/\/mychart.ynhhs.org\/MyChart-PRD\/Billing\/Summary)\n- [Contact Us](https:\/\/www.ynhhs.org\/contact \"Contact Us\")\n- [About](https:\/\/www.ynhhs.org\/about \"About\")\n- [News & Knowledge](https:\/\/www.ynhhs.org\/news-media\/blog \"News & Knowledge\")\n- [Medical Professionals](https:\/\/www.ynhhs.org\/providers \"Medical Professionals\")\n- [Careers](https:\/\/www.ynhhs.org\/careers \"Find a Hospital Near Me\")\n\n[Skip to main content](https:\/\/www.ynhhs.org\/patient-care\/covid-19\/Vaccine\/booster#main)\n\n[Explore Our Health System]()\n\n[Yale New Haven Health](https:\/\/www.ynhhs.org\/) [Bridgeport Hospital](https:\/\/www.bridgeporthospital.org\/) [Yale New Haven Children's Hospital](https:\/\/www.ynhh.org\/childrens-hospital) [Greenwich Hospital](https:\/\/www.greenwichhospital.org\/) [Lawrence + Memorial Hospital](https:\/\/www.lmhospital.org\/) [Yale New Haven Psychiatric Hospital](https:\/\/www.ynhh.org\/psychiatric) [Smilow Cancer Hospital](https:\/\/www.ynhh.org\/smilow) [Yale New Haven Health Urgent Care](https:\/\/www.ynhhs.org\/urgent-care) [Westerly Hospital](https:\/\/www.westerlyhospital.org\/) [Yale New Haven Hospital](https:\/\/www.ynhh.org\/) [Clinical Affiliates](https:\/\/www.ynhhs.org\/clinical-affiliates) [Northeast Medical Group](https:\/\/www.northeastmedicalgroup.org\/)\n\n[Pay a Bill](https:\/\/mychart.ynhhs.org\/MyChart-PRD\/Billing\/Summary)[Contact Us](https:\/\/www.ynhhs.org\/contact \"Contact Us\")[About](https:\/\/www.ynhhs.org\/about \"About\")[News & Knowledge](https:\/\/www.ynhhs.org\/news-media\/blog \"News & Knowledge\")[Medical Professionals](https:\/\/www.ynhhs.org\/providers \"Medical Professionals\")[Careers](https:\/\/www.ynhhs.org\/careers \"Find a Hospital Near Me\")\n\n[![Yale New Haven Health logo](https:\/\/www.ynhhs.org\/-\/media\/Images\/Logo\/YNHHS_hor_clr_484x127.ashx?h=127&iar=0&w=484&hash=11E8047061263B1C6342665F74BC888B)](https:\/\/www.ynhhs.org\/)\n\n- [Find a Doctor](https:\/\/www.ynhhs.org\/find-a-doctor)\n- [Get Care Now](https:\/\/www.ynhhs.org\/get-care-now)\n- Services\n  ### Featured Specialties\n  - [Aging (Geriatrics)](https:\/\/www.ynhhs.org\/patient-care\/aging \"Aging (Geriatrics)\")\n  - [Cancer (Oncology)](https:\/\/www.ynhhs.org\/patient-care\/Cancer \"Cancer (Oncology)\")\n  - [Children’s (Pediatrics)](https:\/\/www.ynhhs.org\/patient-care\/childrens-pediatrics \"Children’s (Pediatrics)\")\n  - [Digestive Disorders (Gastroenterology)](https:\/\/www.ynhhs.org\/patient-care\/digestive-disorders \"Digestive Disorders (Gastroenterology)\")\n  - [Heart & Vascular](https:\/\/www.ynhhs.org\/patient-care\/heart \"Heart & Vascular\")\n  - [Home Healthcare](https:\/\/www.ynhhs.org\/health-at-home)\n  \n  - [Mental Health (Psychiatry)](https:\/\/www.ynhhs.org\/patient-care\/Mental-Health \"Mental Health (Psychiatry)\")\n  - [Neurology & Neurosurgery](https:\/\/www.ynhhs.org\/patient-care\/neurology-and-neurosurgery \"Neurology & Neurosurgery\")\n  - [Orthopedics](https:\/\/www.ynhhs.org\/patient-care\/orthopedics \"Orthopedics\")\n  - [Primary Care](https:\/\/www.ynhhs.org\/patient-care\/primary-care \"Primary Care\")\n  - [Transplantation](https:\/\/www.ynhhs.org\/patient-care\/Transplantation \"Transplantation\")\n  - [Trauma & Burn](https:\/\/www.ynhhs.org\/patient-care\/trauma-and-burn \"Trauma & Burn\")\n  \n  [View All Services](https:\/\/www.ynhhs.org\/patient-care \"View All Services\")\n  \n  ### More Care\n  - [COVID-19 Resources](https:\/\/www.ynhhs.org\/patient-care\/covid-19 \"COVID-19 Vaccine\")\n  - [For Medical Professionals](https:\/\/www.ynhh.org\/medical-professionals \"For Medical Professionals\")\n  - [Get Care Now](https:\/\/www.ynhhs.org\/get-care-now)\n  - [Pharmacy](https:\/\/www.ynhhs.org\/patient-care\/pharmacy)\n  - [Urgent Care](https:\/\/www.ynhhs.org\/urgent-care \"Urgent Care\")\n  \n  close\n- Locations\n  ### Location Type\n  - [Ambulatory \/ Outpatient Care](https:\/\/www.ynhhs.org\/find-a-location#sort=relevancy&numberOfResults=25&f:facilitytype=[Outpatient%20Medical%20Centers])\n  - [Blood Draw](https:\/\/www.ynhhs.org\/find-a-location#f:facilitytype=[Blood%20Draw])\n  - [Cancer (Oncology)](https:\/\/www.ynhhs.org\/find-a-location#f:facilitytype=[Cancer%20\\(Oncology\\)])\n  - [Occupational Care](https:\/\/www.ynhhs.org\/find-a-location#f:facilitytype=[Occupational%20Care])\n  - [Primary Care](https:\/\/www.ynhhs.org\/find-a-location#f:facilitytype=[Primary%20Care])\n  - [Radiology](https:\/\/www.ynhhs.org\/find-a-location#f:facilitytype=[Radiology])\n  - [Urgent Care](https:\/\/www.ynhhs.org\/urgent-care)\n  \n  [View All Our Locations](https:\/\/www.ynhhs.org\/find-a-location)\n  \n  ### Hospitals and Multispecialty Locations\n  - [Bridgeport Hospital](https:\/\/www.bridgeporthospital.org\/ \"Bridgeport Hospital\")\n  - [Greenwich Hospital](https:\/\/www.greenwichhospital.org\/ \"Greenwich Hospital\")\n  - [Lawrence + Memorial Hospital](https:\/\/www.lmhospital.org\/)\n  - [Northeast Medical Group](https:\/\/www.northeastmedicalgroup.org\/find-a-doctor \"Northeast Medical Group\")\n  - [Smilow Cancer Hospital at Yale New Haven](https:\/\/www.ynhh.org\/smilow \"Smilow Cancer Hospital at Yale New Haven\")\n  \n  - [Westerly Hospital](https:\/\/www.westerlyhospital.org\/ \"Westerly Hospital\")\n  - [Yale Medicine](https:\/\/www.yalemedicine.org\/ \"Yale Medicine\")\n  - [Yale New Haven Children's Hospital](https:\/\/www.ynhh.org\/childrens-hospital)\n  - [Yale New Haven Hospital](https:\/\/www.ynhh.org\/ \"Yale New Haven Hospital\")\n  - [Yale New Haven Psychiatric Hospital](https:\/\/www.ynhh.org\/psychiatric \"Yale New Haven Psychiatric Hospital\")\n  \n  close\n- Patients & Visitors\n  ### Patients\n  - [Billing & Insurance](https:\/\/www.ynhhs.org\/patient-care\/billing-insurance \"<br\/> Billing & Insurance\")\n  - [Classes & Events](https:\/\/www.ynhhs.org\/events \"Classes & Events\")\n  - [Financial Assistance](https:\/\/www.ynhhs.org\/patient-care\/billing-insurance\/Financial-assistance \"Financial Assistance\")\n  - [Get Care Now](https:\/\/www.ynhhs.org\/get-care-now)\n  - [Language Services](https:\/\/www.ynhhs.org\/patient-care\/language-services)\n  \n  - [News and Media](https:\/\/www.ynhhs.org\/news-media)\n  - [No Surprises Act](https:\/\/www.ynhhs.org\/patient-care\/Patient-Rights-and-Responsibilities\/no-surprise-billing)\n  - [Patient Guidelines](https:\/\/www.ynhhs.org\/patients-visitors\/preparing\/visitor-policy \"Patient Guidelines\")\n  - [Patient Rights and Responsibilities](https:\/\/www.ynhhs.org\/patient-care\/Patient-Rights-and-Responsibilities \"Patient Rights and Responsibilities\")\n  - [Pay Your Bill](https:\/\/mychart.ynhhs.org\/MyChart-PRD\/ \"Pay Your Bill\")\n  \n  [View All Patient & Visitor Information](https:\/\/www.ynhhs.org\/patients-visitors)\n  \n  ### Patient Tools\n  - [Make An Appointment](https:\/\/www.ynhhs.org\/make-an-appointment \"Make An Appointment\")\n  - [Prescription Refills](https:\/\/mychart.ynhhs.org\/ \"Prescription Refills\")\n  - [Request Medical Records](https:\/\/www.ynhhs.org\/online-tools\/Request-Medical-Records \"Request Medical Records\")\n  - [Thank Your Caregiver - ThinkThanks Employee Spotlight](https:\/\/www.ynhhs.org\/employee-spotlight)\n  \n  close\n\n[![My chart icon, a folder with a heart in the middle.](https:\/\/www.ynhhs.org\/-\/media\/Images\/Icons\/Header-Icons\/icon-mychart-header.ashx?iar=0&hash=65F8CEB084B4838CD046EF032FAA6222) MyChart](https:\/\/mychart.ynhhs.org\/MyChart-PRD\/Authentication\/Login)\n\nSearch ![Search icon magnifying glass](https:\/\/www.ynhhs.org\/-\/media\/Images\/Icons\/Header-Icons\/icon-search.ashx?iar=0&hash=9B497E70A197DB7B978628BC7F382EB4) ![close search](https:\/\/www.ynhhs.org\/-\/media\/Images\/Icons\/Header-Icons\/close-search.ashx?iar=0&hash=ADF7FAD1D54E8EA37EB30B6DB3D09526)\n\n[![Yale New Haven Health logo](https:\/\/www.ynhhs.org\/-\/media\/Images\/Logo\/YNHHS_hor_clr_484x127.ashx?h=127&iar=0&w=484&hash=11E8047061263B1C6342665F74BC888B)](https:\/\/www.ynhhs.org\/)  ![Search icon magnifying glass](https:\/\/www.ynhhs.org\/-\/media\/Images\/Icons\/Header-Icons\/icon-search.ashx?iar=0&hash=9B497E70A197DB7B978628BC7F382EB4)\n\n### Popular Services\n- [Gastroenterology](https:\/\/www.ynhhs.org\/patient-care\/digestive-disorders)\n- [Neurology & Neurosurgery](https:\/\/www.ynhhs.org\/patient-care\/neurology-and-neurosurgery)\n- [Primary Care](https:\/\/www.ynhhs.org\/patient-care\/primary-care)\n\n[View All Services](https:\/\/www.ynhhs.org\/patient-care)\n\n### Popular Locations\n- [North Haven Medical Center](https:\/\/www.ynhhs.org\/locations\/north-haven-6-devine-street)\n- [Park Avenue Medical Center](https:\/\/www.ynhhs.org\/locations\/trumbull-5520-park-avenue-medical-center)\n- [Yale New Haven Hospital - York Street Campus](https:\/\/www.ynhhs.org\/locations\/new-haven-20-york-street)\n\n[View All Locations](https:\/\/www.ynhhs.org\/find-a-location)\n\n#### Frequent Searches\n- [Medical Records](https:\/\/www.ynhhs.org\/online-tools\/Request-Medical-Records)\n- [MyChart](https:\/\/mychart.ynhhs.org\/MyChart-PRD\/)\n- [Primary Care Physician](https:\/\/www.ynhhs.org\/patient-care\/primary-care)\n\n![](https:\/\/www.ynhhs.org\/Dist\/img\/contrast-icon.svg)\n\nContrast\n\nOff\n\nOn\n\n[![](https:\/\/www.ynhhs.org\/Dist\/img\/contact-icon.svg) Contact](https:\/\/www.ynhhs.org\/contact)\n\n![](https:\/\/www.ynhhs.org\/Dist\/img\/share-icon.svg)\n\nShare\n\n[![](https:\/\/www.ynhhs.org\/Dist\/img\/donate-icon.svg) Donate](https:\/\/www.givetoynhh.org\/)\n\n[![](https:\/\/www.ynhhs.org\/Dist\/img\/mychar-icon.svg) MyChart](https:\/\/mychart.ynhhs.org\/MyChart-PRD\/Authentication\/Login)\n\nHelp\n\n![](https:\/\/www.ynhhs.org\/Dist\/img\/contrast-icon.svg)\n\nContrast\n\nOff\n\nOn\n\n[![](https:\/\/www.ynhhs.org\/Dist\/img\/contact-icon.svg) Contact](https:\/\/www.ynhhs.org\/contact)\n\n![](https:\/\/www.ynhhs.org\/Dist\/img\/share-icon.svg)\n\nShare\n\n[![](https:\/\/www.ynhhs.org\/Dist\/img\/donate-icon.svg) Donate](https:\/\/www.givetoynhh.org\/)\n\n[![](https:\/\/www.ynhhs.org\/Dist\/img\/mychar-icon.svg) MyChart](https:\/\/mychart.ynhhs.org\/MyChart-PRD\/Authentication\/Login)\n\n#### Explore this section\n- [Vaccine Information](https:\/\/www.ynhhs.org\/patient-care\/covid-19\/Vaccine)\n  - [Schedule a COVID-19 Vaccine](https:\/\/www.ynhhs.org\/patient-care\/covid-19\/Vaccine\/get-your-covid-vaccine)\n\n- [Home](https:\/\/www.ynhhs.org\/)\n- [COVID-19 Resources](https:\/\/www.ynhhs.org\/patient-care\/covid-19)\n- [Vaccine Information](https:\/\/www.ynhhs.org\/patient-care\/covid-19\/Vaccine)\n- Booster or Third Dose?\n\n# FAQ: Booster vs Third Dose Eligibility\nYou may be wondering if you should get an additional dose. We answered some frequently asked questions below.\n\n#### What is the difference between a “third dose” and a “booster”?\nA “third dose” of an mRNA vaccine is available to people who may not have had a strong enough immune response after receiving the first two doses. For example, those who are immunocompromised need a third dose to reach a stronger level of immunity against the virus.   \n   \n A “booster” is an additional vaccine dose given to individuals who may have waning immunity because they completed their initial vaccine series many months ago.\n\n#### Who is eligible for a third dose?\nA third dose of the Pfizer or Moderna vaccine is available for people with certain immunocompromised conditions including current treatment for cancer, those who received an organ transplant or those with advanced or untreated HIV.\n\n[Visit the Centers for Disease Control and Prevention site for the latest additional dose information for immunocompromised individuals.](https:\/\/www.cdc.gov\/coronavirus\/2019-ncov\/vaccines\/recommendations\/immuno.html)\n#### Who is eligible for a booster?\nCDC recommends everyone stay up to date with COVID-19 vaccines for their age group.\n\n[Visit the Centers for Disease Control and Prevention site for the latest COVID vaccine eligibility requirements](https:\/\/www.cdc.gov\/coronavirus\/2019-ncov\/vaccines\/stay-up-to-date.html?s_cid=11369:cdc%20children%20covid%20vaccine:sem.ga:p:RG:GM:gen:PTN:FY21)\n#### Can I \"mix and match\" vaccines for my booster shot?\nThe CDC now allows for recipients to [\"mix and match\"](https:\/\/www.ynhhs.org\/patient-care\/covid-19\/Vaccine\/Mix-and-Match-Vaccines) their booster shot. That means if your first two doses were with the Pfizer vaccine, you can receive a booster dose with the Moderna vaccine. If you received a Johnson & Johnson vaccine, you are eligible to receive a Pfizer or Moderna booster shot.\n\n#### I do not have any underlying conditions. Why would I need a booster?\nThe available data shows people who got their initial doses of the vaccine may have waning immunity after a period of time. A booster shot can help boost protection against COVID-19.\n\n#### Will I experience the same side effects for this extra dose as I did for my previous shots?\nReactions reported after an additional dose were similar to that of the two-dose series: fatigue and pain at injection site were the most commonly reported side effects, and overall, most symptoms were mild to moderate. However, as with the two-dose series, serious side effects are rare, but may occur.\n\n#### [COVID-19 Resources](https:\/\/www.ynhhs.org\/patient-care\/covid-19)\n[Vaccine Information](https:\/\/www.ynhhs.org\/patient-care\/covid-19\/Vaccine)\n\n- [Schedule a COVID-19 Vaccine](https:\/\/www.ynhhs.org\/patient-care\/covid-19\/Vaccine\/get-your-covid-vaccine)\n\n[![Yale New Haven Health logo](https:\/\/www.ynhhs.org\/-\/media\/Images\/Logo\/YNHHS\/logoynhh2x.ashx?mh=75&mw=128&hash=D610B41CB188540CD323C7D0702581D7)](https:\/\/www.ynhhs.org\/)\n\n[Bridgeport Hospital](https:\/\/www.bridgeporthospital.org\/) [Yale New Haven Children's Hospital](https:\/\/www.ynhh.org\/childrens-hospital) [Greenwich Hospital](https:\/\/www.greenwichhospital.org\/) [Lawrence + Memorial Hospital](https:\/\/www.lmhospital.org\/) [Yale New Haven Psychiatric Hospital](https:\/\/www.ynhh.org\/psychiatric) [Smilow Cancer Hospital](https:\/\/www.ynhh.org\/smilow) [Yale New Haven Health Urgent Care](https:\/\/www.ynhhs.org\/urgent-care) [Westerly Hospital](https:\/\/www.westerlyhospital.org\/) [Yale New Haven Hospital](https:\/\/www.ynhh.org\/) [Clinical Affiliates](https:\/\/www.ynhhs.org\/clinical-affiliates) [Northeast Medical Group](https:\/\/www.northeastmedicalgroup.org\/)\n\nWith the greatest of care.\n***\n\nFor Patients\n\n[find a location](https:\/\/www.ynhhs.org\/find-a-location)[Find a Doctor or Specialist](https:\/\/www.ynhhs.org\/find-a-doctor \"Find a doctor or specialist\")[Find a job](https:\/\/www.ynhhs.org\/careers \"Find a job\")[Log into MyChart](https:\/\/mychart.ynhhs.org\/)[Pay My Bill](https:\/\/mychart.ynhhs.org\/MyChart-PRD\/)[View news & events](\"View news & events\")[Become a vendor](https:\/\/www.ynhhs.org\/vendors \"Become a vendor\")\n\nFind Information For\n\n[Providers](https:\/\/www.ynhhs.org\/providers \"Providers\")[Job Seekers](https:\/\/www.ynhhs.org\/careers \"Job Seekers\")[Employees](http:\/\/portal.ynhh.org\/)[giving](https:\/\/www.ynhhs.org\/giving)[Media](https:\/\/www.ynhhs.org\/news-media \"Media\")[Vendors](https:\/\/www.ynhhs.org\/vendors \"Vendors\")[Manage Cookie Preferences](https:\/\/www.ynhhs.org\/patient-care\/covid-19\/Vaccine\/booster)\n\nContact Us\n\nYale New Haven Health System  \n 789 Howard Avenue  \n New Haven, CT 06519\n\n© Copyright 2026 Yale New Haven Health\n\n[Policies](https:\/\/www.ynhhs.org\/policies \"Policies\")[For Employees](http:\/\/portal.ynhh.org\/ \"For Employees\")[Non-discrimination](https:\/\/www.ynhhs.org\/policies#nond \"For Employees\")[Contact Us](\"Contact Us\")","attrs_readable_markdown":"A “third dose” of an mRNA vaccine is available to people who may not have had a strong enough immune response after receiving the first two doses. For example, those who are immunocompromised need a third dose to reach a stronger level of immunity against the virus.\n\nA “booster” is an additional vaccine dose given to individuals who may have waning immunity because they completed their initial vaccine series many months ago.\n\nA third dose of the Pfizer or Moderna vaccine is available for people with certain immunocompromised conditions including current treatment for cancer, those who received an organ transplant or those with advanced or untreated HIV.\n\n[Visit the Centers for Disease Control and Prevention site for the latest additional dose information for immunocompromised individuals.](https:\/\/www.cdc.gov\/coronavirus\/2019-ncov\/vaccines\/recommendations\/immuno.html)\n\nThe CDC now allows for recipients to [\"mix and match\"](https:\/\/www.ynhhs.org\/patient-care\/covid-19\/Vaccine\/Mix-and-Match-Vaccines) their booster shot. That means if your first two doses were with the Pfizer vaccine, you can receive a booster dose with the Moderna vaccine. If you received a Johnson & Johnson vaccine, you are eligible to receive a Pfizer or Moderna booster shot.\n\nI do not have any underlying conditions. Why would I need a booster?\n\nThe available data shows people who got their initial doses of the vaccine may have waning immunity after a period of time. A booster shot can help boost protection against COVID-19.\n\nWill I experience the same side effects for this extra dose as I did for my previous shots?\n\nReactions reported after an additional dose were similar to that of the two-dose series: fatigue and pain at injection site were the most commonly reported side effects, and overall, most symptoms were mild to moderate. However, as with the two-dose series, serious side effects are rare, but may occur.","meta_canonical":null}

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URL	https://www.ynhhs.org/patient-care/covid-19/Vaccine/booster
Last Crawled	2026-03-07 09:39:52 (1 month ago)
First Indexed	2021-09-24 23:16:15 (4 years ago)
HTTP Status Code	200
Meta Title	Booster or Third Dose?
Meta Description	CDC recommends everyone stay up to date with COVID-19 vaccines for their age group.
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Boilerpipe Text	A “third dose” of an mRNA vaccine is available to people who may not have had a strong enough immune response after receiving the first two doses. For example, those who are immunocompromised need a third dose to reach a stronger level of immunity against the virus. A “booster” is an additional vaccine dose given to individuals who may have waning immunity because they completed their initial vaccine series many months ago. A third dose of the Pfizer or Moderna vaccine is available for people with certain immunocompromised conditions including current treatment for cancer, those who received an organ transplant or those with advanced or untreated HIV. Visit the Centers for Disease Control and Prevention site for the latest additional dose information for immunocompromised individuals. The CDC now allows for recipients to "mix and match" their booster shot. That means if your first two doses were with the Pfizer vaccine, you can receive a booster dose with the Moderna vaccine. If you received a Johnson & Johnson vaccine, you are eligible to receive a Pfizer or Moderna booster shot. I do not have any underlying conditions. Why would I need a booster? The available data shows people who got their initial doses of the vaccine may have waning immunity after a period of time. A booster shot can help boost protection against COVID-19. Will I experience the same side effects for this extra dose as I did for my previous shots? Reactions reported after an additional dose were similar to that of the two-dose series: fatigue and pain at injection site were the most commonly reported side effects, and overall, most symptoms were mild to moderate. However, as with the two-dose series, serious side effects are rare, but may occur.
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We answered some frequently asked questions below. #### What is the difference between a “third dose” and a “booster”? A “third dose” of an mRNA vaccine is available to people who may not have had a strong enough immune response after receiving the first two doses. For example, those who are immunocompromised need a third dose to reach a stronger level of immunity against the virus. A “booster” is an additional vaccine dose given to individuals who may have waning immunity because they completed their initial vaccine series many months ago. #### Who is eligible for a third dose? A third dose of the Pfizer or Moderna vaccine is available for people with certain immunocompromised conditions including current treatment for cancer, those who received an organ transplant or those with advanced or untreated HIV. [Visit the Centers for Disease Control and Prevention site for the latest additional dose information for immunocompromised individuals.](https://www.cdc.gov/coronavirus/2019-ncov/vaccines/recommendations/immuno.html) #### Who is eligible for a booster? CDC recommends everyone stay up to date with COVID-19 vaccines for their age group. [Visit the Centers for Disease Control and Prevention site for the latest COVID vaccine eligibility requirements](https://www.cdc.gov/coronavirus/2019-ncov/vaccines/stay-up-to-date.html?s_cid=11369:cdc%20children%20covid%20vaccine:sem.ga:p:RG:GM:gen:PTN:FY21) #### Can I "mix and match" vaccines for my booster shot? The CDC now allows for recipients to ["mix and match"](https://www.ynhhs.org/patient-care/covid-19/Vaccine/Mix-and-Match-Vaccines) their booster shot. That means if your first two doses were with the Pfizer vaccine, you can receive a booster dose with the Moderna vaccine. If you received a Johnson & Johnson vaccine, you are eligible to receive a Pfizer or Moderna booster shot. #### I do not have any underlying conditions. Why would I need a booster? The available data shows people who got their initial doses of the vaccine may have waning immunity after a period of time. A booster shot can help boost protection against COVID-19. #### Will I experience the same side effects for this extra dose as I did for my previous shots? Reactions reported after an additional dose were similar to that of the two-dose series: fatigue and pain at injection site were the most commonly reported side effects, and overall, most symptoms were mild to moderate. 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Readable Markdown	A “third dose” of an mRNA vaccine is available to people who may not have had a strong enough immune response after receiving the first two doses. For example, those who are immunocompromised need a third dose to reach a stronger level of immunity against the virus. A “booster” is an additional vaccine dose given to individuals who may have waning immunity because they completed their initial vaccine series many months ago. A third dose of the Pfizer or Moderna vaccine is available for people with certain immunocompromised conditions including current treatment for cancer, those who received an organ transplant or those with advanced or untreated HIV. [Visit the Centers for Disease Control and Prevention site for the latest additional dose information for immunocompromised individuals.](https://www.cdc.gov/coronavirus/2019-ncov/vaccines/recommendations/immuno.html) The CDC now allows for recipients to ["mix and match"](https://www.ynhhs.org/patient-care/covid-19/Vaccine/Mix-and-Match-Vaccines) their booster shot. That means if your first two doses were with the Pfizer vaccine, you can receive a booster dose with the Moderna vaccine. If you received a Johnson & Johnson vaccine, you are eligible to receive a Pfizer or Moderna booster shot. I do not have any underlying conditions. Why would I need a booster? The available data shows people who got their initial doses of the vaccine may have waning immunity after a period of time. A booster shot can help boost protection against COVID-19. Will I experience the same side effects for this extra dose as I did for my previous shots? Reactions reported after an additional dose were similar to that of the two-dose series: fatigue and pain at injection site were the most commonly reported side effects, and overall, most symptoms were mild to moderate. However, as with the two-dose series, serious side effects are rare, but may occur.
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