{"id":1535,"date":"2021-08-09T08:59:59","date_gmt":"2021-08-09T12:59:59","guid":{"rendered":"https:\/\/covidqanda.org\/?p=1535"},"modified":"2021-08-09T08:59:59","modified_gmt":"2021-08-09T12:59:59","slug":"any-updates-on-asymptomatic-transmission","status":"publish","type":"post","link":"https:\/\/covidqanda.org\/?p=1535","title":{"rendered":"Any updates on asymptomatic transmission?"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong><span style=\"text-decoration: underline;\">Question:<\/span><\/strong>\u00a0Do you have any recent data to share about covid transmission by asymptomatic carriers? In looking at your daily qanda I did not see anything more recent that July 2020, unless I missed it.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"text-decoration: underline;\"><strong>Answer:\u00a0<\/strong><\/span> There are a few more recent posts I recommend you check out&#8211;\u00a0<a href=\"https:\/\/covidqanda.org\/?p=1220\">Q&amp;A of 3\/13\/21<\/a>\u00a0describes the risk of asymptomatic transmission and\u00a0<a href=\"https:\/\/covidqanda.org\/?p=1505\">Q&amp;A of 7\/26\/21<\/a>\u00a0describes the risk of asymptomatic transmission among vaccinated individuals. Of course, the Delta variant upends a bit of what we&#8217;ve\u00a0known about SARS-CoV-2.\u00a0 Here&#8217;s a bit more on what we know\/don&#8217;t know:\u00a0<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Disentangling&nbsp;asymptomatic&nbsp;and presymptomatic cases remains challenging.&nbsp;&nbsp;<a href=\"https:\/\/www.cdc.gov\/coronavirus\/2019-ncov\/hcp\/planning-scenarios.html\">CDC&#8217;s<\/a>&nbsp;current best estimate (from March 19, pre-Delta) is that 30% of infections are asymptomatic. When it comes to breakthrough infections, in its August 2nd update&nbsp;<a href=\"https:\/\/www.cdc.gov\/vaccines\/covid-19\/health-departments\/breakthrough-cases.html\">CDC reports<\/a>,&nbsp;&#8220;1,816 (26%) of 7,101 hospitalizations reported as asymptomatic or not related to COVID-19; 316 (21%) of 1,507 fatal cases reported as asymptomatic or not related to COVID-19.&#8221;<\/li><li>Asymptomatic infections contribute substantially to onward transmission, though to a lesser degree than symptomatic infections (ex:&nbsp;<em><a href=\"https:\/\/www.pnas.org\/content\/118\/9\/e2019716118\">PNAS<\/a>,<\/em>&nbsp;<em><a href=\"https:\/\/www.thelancet.com\/journals\/lanepe\/article\/PIIS2666-7762(21)00059-4\/fulltext\">Lancet: Regional Health<\/a>).&nbsp;<\/em><\/li><li>When it comes to the Delta variant, we now know that vaccinated individuals with breakthrough, symptomatic infections&nbsp;<a href=\"https:\/\/www.cdc.gov\/coronavirus\/2019-ncov\/variants\/delta-variant.html\">can transmit the virus to others<\/a>, but we do *not* know whether vaccinated individuals who are asymptomatically infected can transmit the virus to others.&nbsp;<a href=\"https:\/\/www.cdc.gov\/coronavirus\/2019-ncov\/variants\/delta-variant.html\">CDC is exploring this question<\/a>&nbsp;(among so many others!).&nbsp;&nbsp;<\/li><li>Breakthrough infections (symptomatic or asymptomatic) remain&nbsp;<a href=\"https:\/\/www.kff.org\/policy-watch\/covid-19-vaccine-breakthrough-cases-data-from-the-states\/\">rare<\/a>&nbsp;<strong>(Figure 1)<\/strong>.<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Figure 1. State by State Trends in Percent of Fully Vaccinated Individuals Who Experience Breakthrough Infection\u00a0<\/strong>(from\u00a0<a href=\"https:\/\/www.kff.org\/policy-watch\/covid-19-vaccine-breakthrough-cases-data-from-the-states\/\">July 30 Kaiser Family Foundation analysis<\/a>)*note the X axis is 0%-5%.\u00a0 The highest proportion of fully vaccinated people with breakthrough infection is 0.54% in Arkansas (a state with very low vaccination coverage and very high levels of community transmission).<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"723\" height=\"422\" src=\"https:\/\/i0.wp.com\/covidqanda.org\/wp-content\/uploads\/2021\/08\/image-4.png?resize=723%2C422&#038;ssl=1\" alt=\"\" class=\"wp-image-1536\" srcset=\"https:\/\/i0.wp.com\/covidqanda.org\/wp-content\/uploads\/2021\/08\/image-4.png?resize=1024%2C598&amp;ssl=1 1024w, https:\/\/i0.wp.com\/covidqanda.org\/wp-content\/uploads\/2021\/08\/image-4.png?resize=300%2C175&amp;ssl=1 300w, https:\/\/i0.wp.com\/covidqanda.org\/wp-content\/uploads\/2021\/08\/image-4.png?resize=768%2C449&amp;ssl=1 768w, https:\/\/i0.wp.com\/covidqanda.org\/wp-content\/uploads\/2021\/08\/image-4.png?resize=1536%2C897&amp;ssl=1 1536w, https:\/\/i0.wp.com\/covidqanda.org\/wp-content\/uploads\/2021\/08\/image-4.png?resize=2048%2C1196&amp;ssl=1 2048w, https:\/\/i0.wp.com\/covidqanda.org\/wp-content\/uploads\/2021\/08\/image-4.png?w=1446&amp;ssl=1 1446w, https:\/\/i0.wp.com\/covidqanda.org\/wp-content\/uploads\/2021\/08\/image-4.png?w=2169&amp;ssl=1 2169w\" sizes=\"auto, (max-width: 723px) 100vw, 723px\" \/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Question:\u00a0Do you have any recent data to share about covid transmission by asymptomatic carriers? In looking at your daily qanda I did not see anything more recent that July 2020, unless I missed it. Answer:\u00a0 There are a few more recent posts I recommend you check out&#8211;\u00a0Q&amp;A of 3\/13\/21\u00a0describes the risk of asymptomatic transmission and\u00a0Q&amp;A [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"nf_dc_page":"","om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[60,47,34,18,64],"tags":[120,211,209],"class_list":["post-1535","post","type-post","status-publish","format-standard","hentry","category-risk","category-states","category-symptoms","category-transmission-routes","category-vaccines","tag-asymptomatic","tag-breakthrough","tag-delta","has-post-thumbnail","fallback-thumbnail"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/covidqanda.org\/index.php?rest_route=\/wp\/v2\/posts\/1535","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/covidqanda.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/covidqanda.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/covidqanda.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/covidqanda.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1535"}],"version-history":[{"count":1,"href":"https:\/\/covidqanda.org\/index.php?rest_route=\/wp\/v2\/posts\/1535\/revisions"}],"predecessor-version":[{"id":1537,"href":"https:\/\/covidqanda.org\/index.php?rest_route=\/wp\/v2\/posts\/1535\/revisions\/1537"}],"wp:attachment":[{"href":"https:\/\/covidqanda.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1535"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/covidqanda.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1535"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/covidqanda.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1535"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}