{"id":6871,"date":"2020-05-15T17:36:28","date_gmt":"2020-05-16T00:36:28","guid":{"rendered":"https:\/\/depts.washington.edu\/pandemicalliance\/?p=6871"},"modified":"2021-03-17T17:37:22","modified_gmt":"2021-03-18T00:37:22","slug":"time-is-of-the-essence-impact-of-delays-on-effectiveness-of-contact-tracing-for-covid-19","status":"publish","type":"post","link":"https:\/\/depts.washington.edu\/pandemicalliance\/2020\/05\/15\/time-is-of-the-essence-impact-of-delays-on-effectiveness-of-contact-tracing-for-covid-19\/","title":{"rendered":"Time Is of the Essence Impact of Delays on Effectiveness of Contact Tracing for COVID-19"},"content":{"rendered":"<ul>\n<li><span data-contrast=\"auto\">Researchers modeled the impact of delays in contact tracing strategies (CTS) and found that testing delay (time between onset of symptoms to testing and diagnosis) could seriously attenuate any contact tracing efforts. A testing delay of 3 days would require contacts to be traced within 1 day and with 80% coverage to keep\u00a0<\/span><span data-contrast=\"auto\">the\u00a0<\/span><span data-contrast=\"auto\">effective reproduction number\u00a0<\/span><span data-contrast=\"auto\">(<\/span><span data-contrast=\"auto\">R<\/span><span data-contrast=\"auto\">)<\/span><span data-contrast=\"auto\">\u00a0below 1<\/span><span data-contrast=\"auto\">. A<\/span><span data-contrast=\"auto\">\u00a0testing delay of 4 days would prevent the R from going below\u00a0<\/span><span data-contrast=\"auto\">1<\/span><span data-contrast=\"auto\">\u00a0even with the most efficient CTS (0 tracing delay, 100% coverage).<\/span><span data-ccp-props=\"{&quot;134233117&quot;:true,&quot;134233118&quot;:true,&quot;201341983&quot;:0,&quot;335559740&quot;:240}\">\u00a0<\/span><\/li>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"36\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"auto\">The findings also highlight the effectivene<\/span><span data-contrast=\"auto\">ss of app-based contact tracing<\/span><span data-contrast=\"auto\">\u00a0and estimates\u00a0<\/span><span data-contrast=\"auto\">indicate\u00a0<\/span><span data-contrast=\"auto\">that even with only 20% coverage, it is superior to conventional contact tracing<\/span><span data-contrast=\"auto\">.<\/span><span data-contrast=\"auto\">\u00a0<\/span><span data-ccp-props=\"{&quot;134233117&quot;:true,&quot;134233118&quot;:true,&quot;201341983&quot;:0,&quot;335559740&quot;:240}\">\u00a0<\/span><\/li>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"36\" data-aria-posinset=\"2\" data-aria-level=\"1\"><span data-contrast=\"auto\">This model assumes a baseline R of 1.2, no transmission in healthcare settings, and that all index cases and contacts no longer transmit the virus.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:true,&quot;134233118&quot;:true,&quot;201341983&quot;:0,&quot;335559740&quot;:240}\">\u00a0<\/span><\/li>\n<\/ul>\n<p><i><span data-contrast=\"none\">Kretzschmar<\/span><\/i><i><span data-contrast=\"none\">\u00a0et al<\/span><\/i><i><span data-contrast=\"none\">. (<\/span><\/i><i><span data-contrast=\"none\">May 15,\u00a0<\/span><\/i><i><span data-contrast=\"none\">2020). Time Is of the Essence Impact of Delays on Effectiveness of Contact Tracing for COVID-19.\u00a0<\/span><\/i><i><span data-contrast=\"none\">Preprint\u00a0downloaded May 15 from<\/span><\/i><i><span data-contrast=\"none\">\u00a0<\/span><\/i><a href=\"https:\/\/doi.org\/10.1101\/2020.05.09.20096289\"><span data-contrast=\"none\">https:\/\/doi.org\/10.1101\/2020.05.09.20096289<\/span><\/a><span data-ccp-props=\"{&quot;134233117&quot;:true,&quot;134233118&quot;:true,&quot;201341983&quot;:0,&quot;335559685&quot;:720,&quot;335559740&quot;:240}\">\u00a0<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Researchers modeled the impact of delays in contact tracing strategies (CTS) and found that testing delay (time between onset of symptoms to testing and diagnosis) could seriously attenuate any contact tracing efforts. A testing delay of 3 days would require contacts to be traced within 1 day and with 80% coverage to keep\u00a0the\u00a0effective reproduction number\u00a0(R)\u00a0below&#8230;<\/p>\n<div><a class=\"more\" href=\"https:\/\/depts.washington.edu\/pandemicalliance\/2020\/05\/15\/time-is-of-the-essence-impact-of-delays-on-effectiveness-of-contact-tracing-for-covid-19\/\">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":[],"topic":[23],"class_list":["post-6871","post","type-post","status-publish","format-standard","hentry","category-article-summary","topic-modeling-and-prediction"],"_links":{"self":[{"href":"https:\/\/depts.washington.edu\/pandemicalliance\/wp-json\/wp\/v2\/posts\/6871","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=6871"}],"version-history":[{"count":1,"href":"https:\/\/depts.washington.edu\/pandemicalliance\/wp-json\/wp\/v2\/posts\/6871\/revisions"}],"predecessor-version":[{"id":6872,"href":"https:\/\/depts.washington.edu\/pandemicalliance\/wp-json\/wp\/v2\/posts\/6871\/revisions\/6872"}],"wp:attachment":[{"href":"https:\/\/depts.washington.edu\/pandemicalliance\/wp-json\/wp\/v2\/media?parent=6871"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/depts.washington.edu\/pandemicalliance\/wp-json\/wp\/v2\/categories?post=6871"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/depts.washington.edu\/pandemicalliance\/wp-json\/wp\/v2\/tags?post=6871"},{"taxonomy":"topic","embeddable":true,"href":"https:\/\/depts.washington.edu\/pandemicalliance\/wp-json\/wp\/v2\/topic?post=6871"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}