{"id":9662,"date":"2026-01-27T15:45:00","date_gmt":"2026-01-27T20:45:00","guid":{"rendered":"https:\/\/stillcoviding.ca\/en\/?p=9662"},"modified":"2026-01-27T23:50:56","modified_gmt":"2026-01-28T04:50:56","slug":"this-years-pfizer-covid-vaccine-estimated-to-be-57-effective-against-emergency-urgent-care","status":"publish","type":"post","link":"https:\/\/stillcoviding.ca\/en\/news\/this-years-pfizer-covid-vaccine-estimated-to-be-57-effective-against-emergency-urgent-care\/","title":{"rendered":"This year\u2019s Pfizer COVID vaccine estimated to be 57% effective against emergency, urgent care"},"content":{"rendered":"<p>The 2025-26 Pfizer COVID-19 vaccine is about 57% effective against emergency department\/urgent care (ED\/UC) visits and 54% effective against outpatient visits among adults roughly 4&nbsp;weeks after vaccination, with considerable uncertainty, according to preliminary <a target=\"_blank\" lang=\"en\" href=\"https:\/\/www.medrxiv.org\/content\/10.64898\/2026.01.22.26344618v1\" rel=\"noreferrer noopener\">estimates<\/a> published on the preprint server medRxiv.<\/p>\n<p>A team that included researchers from the Providence Veterans Affairs (VA) Healthcare System and Pfizer used a test-negative case-control design to estimate the early vaccine effectiveness (VE) of Pfizer\u2019s BNT162b2 LP.8.1 vaccine against ED\/UC and outpatient visits.<\/p>\n<p>Participants were VA patients who had an acute respiratory infection (ARI) and underwent COVID-19 testing from September&nbsp;10 to November&nbsp;30, 2025.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The 2025-26 Pfizer COVID-19 vaccine is about 57% effective against emergency department\/urgent care (ED\/UC) visits and 54% effective against outpatient visits among adults roughly 4&nbsp;weeks after vaccination, with considerable uncertainty, according to preliminary <a target=\"_blank\" lang=\"en\" href=\"https:\/\/www.medrxiv.org\/content\/10.64898\/2026.01.22.26344618v1\" rel=\"noreferrer noopener\">estimates<\/a> published on the preprint server medRxiv.<\/p>\n<p>A team that included researchers from the Providence Veterans Affairs (VA) Healthcare System and Pfizer used a test-negative case-control design to estimate the early vaccine effectiveness (VE) of Pfizer\u2019s BNT162b2 LP.8.1 vaccine against ED\/UC and outpatient visits.<\/p>\n<p>Participants were VA patients who had an acute respiratory infection (ARI) and underwent COVID-19 testing from September&nbsp;10 to November&nbsp;30, 2025.<\/p>\n<div class=\"more-link-wrapper\"><a class=\"more-link\" href=\"https:\/\/stillcoviding.ca\/en\/news\/this-years-pfizer-covid-vaccine-estimated-to-be-57-effective-against-emergency-urgent-care\/\">Continue reading<span class=\"screen-reader-text\">This year\u2019s Pfizer COVID vaccine estimated to be 57% effective against emergency, urgent care<\/span><\/a><\/div>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[18,252,835,8,14,917,15],"class_list":["post-9662","post","type-post","status-publish","format-standard","hentry","category-news","tag-covid-19","tag-pfizer","tag-pfizer-biontech","tag-research","tag-sars-cov-2","tag-vaccine-effectiveness","tag-vaccines","entry"],"_links":{"self":[{"href":"https:\/\/stillcoviding.ca\/en\/wp-json\/wp\/v2\/posts\/9662","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/stillcoviding.ca\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/stillcoviding.ca\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/stillcoviding.ca\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/stillcoviding.ca\/en\/wp-json\/wp\/v2\/comments?post=9662"}],"version-history":[{"count":2,"href":"https:\/\/stillcoviding.ca\/en\/wp-json\/wp\/v2\/posts\/9662\/revisions"}],"predecessor-version":[{"id":9664,"href":"https:\/\/stillcoviding.ca\/en\/wp-json\/wp\/v2\/posts\/9662\/revisions\/9664"}],"wp:attachment":[{"href":"https:\/\/stillcoviding.ca\/en\/wp-json\/wp\/v2\/media?parent=9662"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/stillcoviding.ca\/en\/wp-json\/wp\/v2\/categories?post=9662"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/stillcoviding.ca\/en\/wp-json\/wp\/v2\/tags?post=9662"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}