{"id":6976,"date":"2021-03-18T15:29:18","date_gmt":"2021-03-18T22:29:18","guid":{"rendered":"https:\/\/depts.washington.edu\/pandemicalliance\/?p=6976"},"modified":"2021-03-19T15:30:26","modified_gmt":"2021-03-19T22:30:26","slug":"assessment-of-protection-against-reinfection-with-sars-cov-2-among-4-million-pcr-tested-individuals-in-denmark-in-2020-a-population-level-observational-study","status":"publish","type":"post","link":"https:\/\/depts.washington.edu\/pandemicalliance\/2021\/03\/18\/assessment-of-protection-against-reinfection-with-sars-cov-2-among-4-million-pcr-tested-individuals-in-denmark-in-2020-a-population-level-observational-study\/","title":{"rendered":"Assessment of Protection against Reinfection with SARS-CoV-2 among 4 Million PCR-Tested Individuals in Denmark in 2020: A Population-Level Observational Study"},"content":{"rendered":"<ul>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Individuals with a positive SARS-CoV-2 PCR test during the first surge in Denmark (prior to June 2020) were less likely to get a positive test during the second surge (September to December 2020) compared to individuals with a negative SARS-CoV-2 PCR test during the first surge. In this nationwide cohort study (n=525,339), 72 of 11,068 (0.65%) individuals who were initially positive retested positive again compared to 16,819 of 514,271 (3.27%) who were initially negative but retested positive, suggesting an estimated protection against a repeat infection of 80%. Among those aged 65 years and older, observed protection against a repeat infection was 47%. [<\/span><i><span style=\"font-weight: 400\">EDITORIAL NOTE: Differences between those who do and do not retest for SARS-CoV-2 after an initial positive or negative test result could affect the observed test positivity. Conclusions based on these findings about the effectiveness of prior infection against re-infection should be made with caution.]<\/span><\/i><\/li>\n<\/ul>\n<p><i><span style=\"font-weight: 400\">Hansen et al.\u00a0(Mar 17, 2021). Assessment of Protection against Reinfection with SARS-CoV-2 among 4 Million PCR-Tested Individuals in Denmark in 2020: A Population-Level Observational Study. The Lancet. <\/span><\/i><a href=\"https:\/\/doi.org\/10.1016\/S0140-6736(21)00575-4\"><span style=\"font-weight: 400\">https:\/\/doi.org\/10.1016\/S0140-6736(21)00575-4<\/span><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Individuals with a positive SARS-CoV-2 PCR test during the first surge in Denmark (prior to June 2020) were less likely to get a positive test during the second surge (September to December 2020) compared to individuals with a negative SARS-CoV-2 PCR test during the first surge. In this nationwide cohort study (n=525,339), 72 of 11,068&#8230;<\/p>\n<div><a class=\"more\" href=\"https:\/\/depts.washington.edu\/pandemicalliance\/2021\/03\/18\/assessment-of-protection-against-reinfection-with-sars-cov-2-among-4-million-pcr-tested-individuals-in-denmark-in-2020-a-population-level-observational-study\/\">Read more<\/a><\/div>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[6],"tags":[32,57],"topic":[31],"class_list":["post-6976","post","type-post","status-publish","format-standard","hentry","category-article-summary","tag-immunity","tag-reinfection","topic-vaccines-and-immunity"],"_links":{"self":[{"href":"https:\/\/depts.washington.edu\/pandemicalliance\/wp-json\/wp\/v2\/posts\/6976","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/depts.washington.edu\/pandemicalliance\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/depts.washington.edu\/pandemicalliance\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/depts.washington.edu\/pandemicalliance\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/depts.washington.edu\/pandemicalliance\/wp-json\/wp\/v2\/comments?post=6976"}],"version-history":[{"count":1,"href":"https:\/\/depts.washington.edu\/pandemicalliance\/wp-json\/wp\/v2\/posts\/6976\/revisions"}],"predecessor-version":[{"id":6977,"href":"https:\/\/depts.washington.edu\/pandemicalliance\/wp-json\/wp\/v2\/posts\/6976\/revisions\/6977"}],"wp:attachment":[{"href":"https:\/\/depts.washington.edu\/pandemicalliance\/wp-json\/wp\/v2\/media?parent=6976"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/depts.washington.edu\/pandemicalliance\/wp-json\/wp\/v2\/categories?post=6976"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/depts.washington.edu\/pandemicalliance\/wp-json\/wp\/v2\/tags?post=6976"},{"taxonomy":"topic","embeddable":true,"href":"https:\/\/depts.washington.edu\/pandemicalliance\/wp-json\/wp\/v2\/topic?post=6976"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}