{"id":48753,"date":"2020-10-07T22:02:09","date_gmt":"2020-10-07T21:02:09","guid":{"rendered":"https:\/\/blogs.bmj.com\/bmj\/?p=48753"},"modified":"2020-10-12T18:27:23","modified_gmt":"2020-10-12T17:27:23","slug":"covid-19-modelling-the-pandemic","status":"publish","type":"post","link":"https:\/\/blogs.bmj.com\/bmj\/2020\/10\/07\/covid-19-modelling-the-pandemic\/","title":{"rendered":"Covid-19: Modelling the pandemic"},"content":{"rendered":"<p class=\"standfirst\">Several predictions made by experts ahead of the UK-wide lockdown in March are confirmed in a detailed re-analysis of the data. The authors explain the background to their research<\/p>\n<p><!--more--><\/p>\n<p><span style=\"font-weight: 400\">When the covid-19 pandemic hit, the reaction of researchers around the world was \u201cHow can I help?\u201d The consequence was thousands of well meaning, but unreviewed preprint papers, and hundreds of suggestions cluttering the inboxes of the government\u2019s scientific advisors.\u00a0\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400\">There had to be a better way. The Royal Society sent an appeal to the computer modelling community to help epidemiologists. \u201cRapid Assistance to Modelling the Pandemic\u201d or RAMP\u2014an acronym which seemed snappy in March\u2014was set up. Soon dozens of coders were seconded to the leading modelling groups, contributing to the signal, not the noise. <\/span><span style=\"font-weight: 400\">We rethought how to do peer review in a crisis. Firstly triage\u2014we crowdsourced reviews of the preprints, then a rapid filtering to an expert review panel, and onwards to the UK government advisory committees SPI-M and SAGE.\u00a0\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400\">With rapid turnaround required by policymakers, even the best groups are in danger of slip ups, so another RAMP task was replication of influential work. We looked at the code for the modelling done by Neil Ferguson from Imperial College London.\u00a0 His group\u2019s blandly-titled \u201cReport 9\u201d predicted half a million deaths from covid-19 if nothing was done, and is generally regarded as \u201cThe Science\u201d behind the lockdown. Reading it carefully, we noticed something surprising\u2014while all the proposed measures slowed the epidemic, school closures increased the total number of deaths. Our first thought was that it was a mistake, but after a little work on the code, <a href=\"https:\/\/www.bmj.com\/content\/371\/bmj.m3588\">we replicated the result<\/a>. The basic explanation for this counter-intuitive result is that an intervention that substantially suppresses the first-wave of the epidemic leads to a stronger second wave once the interventions are lifted.<\/span><\/p>\n<p><span style=\"font-weight: 400\">So, why was this advice ignored? Perhaps because the result only holds if there\u2019s no successful vaccination programme for a couple of years. But more likely, the natural impulse of anyone faced with a result that goes against their preconceived ideas is denial\u2014and scientists are no different in this respect. The UK had planned for a flu epidemic, and schools are a hotbed for influenza transmission. So, even though the low infectivity and morbidity for young people was understood by March, it may have been difficult to accept how different influenza and covid-19 really were, and there may have been some nervousness about trying anything counter-intuitive based on a model.\u00a0 Moreover, failing to suppress the pandemic in the short term, based on a prediction of saving lives in the long term would be politically brave: especially when the identities of those saved could never be known.<\/span><\/p>\n<p><span style=\"font-weight: 400\">While school closures are an interesting case, the general lesson from the model is simple. The effective interventions are those which focus strongly on protecting the vulnerable. Broader measures across all of society turn out to be counterproductive in the long term, even if compliance on the most effective features is uncompromised. In practice, the failure to focus on protecting care homes meant that the first wave was, disastrously, to concentrate the pandemic on the most vulnerable.<\/span><\/p>\n<p><span style=\"font-weight: 400\">Scientific predictions are often published to great fanfare, with retrospective analysis seldom attracting as much attention. Report 9 appeared in March, we completed our study in June, and a lot has happened since. Infections went down steadily during lockdown, as predicted, and at the time of writing are rising again, just as predicted. With hindsight, the Imperial model has proved remarkably accurate. It turned out that the experts really are expert.<\/span><\/p>\n<p><em><strong>Graeme J Ackland<\/strong>, professor of computer simulation, School of Physics and Astronomy, University of Edinburgh.<\/em><\/p>\n<p><em><strong>Competing interests<\/strong>: See full declaration on <a href=\"https:\/\/www.bmj.com\/content\/371\/bmj.m3588\">research paper<\/a>.\u00a0<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Several predictions made by experts ahead of the UK-wide lockdown in March are confirmed in a detailed re-analysis of the data. The authors explain the background to their research [&#8230;]<\/p>\n<p><a class=\"btn btn-secondary understrap-read-more-link\" href=\"https:\/\/blogs.bmj.com\/bmj\/2020\/10\/07\/covid-19-modelling-the-pandemic\/\">More&#8230;<\/a><\/p>\n","protected":false},"author":1,"featured_media":41562,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18894],"tags":[],"class_list":["post-48753","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-authors-perspective"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Covid-19: Modelling the pandemic - The BMJ<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.bmj.com\/bmj\/2020\/10\/07\/covid-19-modelling-the-pandemic\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Covid-19: Modelling the pandemic - The BMJ\" \/>\n<meta property=\"og:description\" content=\"Several predictions made by experts ahead of the UK-wide lockdown in March are confirmed in a detailed re-analysis of the data. The authors explain the background to their research [...]More...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blogs.bmj.com\/bmj\/2020\/10\/07\/covid-19-modelling-the-pandemic\/\" \/>\n<meta property=\"og:site_name\" content=\"The BMJ\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/bmjdotcom\/\" \/>\n<meta property=\"article:published_time\" content=\"2020-10-07T21:02:09+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2020-10-12T17:27:23+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/blogs.bmj.com\/bmj\/files\/2018\/03\/data_big.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"540\" \/>\n\t<meta property=\"og:image:height\" content=\"350\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"BMJ\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@bmj_latest\" \/>\n<meta name=\"twitter:site\" content=\"@bmj_latest\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"BMJ\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/blogs.bmj.com\\\/bmj\\\/2020\\\/10\\\/07\\\/covid-19-modelling-the-pandemic\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/blogs.bmj.com\\\/bmj\\\/2020\\\/10\\\/07\\\/covid-19-modelling-the-pandemic\\\/\"},\"author\":{\"name\":\"BMJ\",\"@id\":\"https:\\\/\\\/blogs.bmj.com\\\/bmj\\\/#\\\/schema\\\/person\\\/ba3da426ed20e8f1d933ca367d8216fe\"},\"headline\":\"Covid-19: Modelling the pandemic\",\"datePublished\":\"2020-10-07T21:02:09+00:00\",\"dateModified\":\"2020-10-12T17:27:23+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/blogs.bmj.com\\\/bmj\\\/2020\\\/10\\\/07\\\/covid-19-modelling-the-pandemic\\\/\"},\"wordCount\":628,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/blogs.bmj.com\\\/bmj\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/blogs.bmj.com\\\/bmj\\\/2020\\\/10\\\/07\\\/covid-19-modelling-the-pandemic\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/blogs.bmj.com\\\/bmj\\\/files\\\/2018\\\/03\\\/data_big.jpg\",\"articleSection\":[\"Author's perspective\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/blogs.bmj.com\\\/bmj\\\/2020\\\/10\\\/07\\\/covid-19-modelling-the-pandemic\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/blogs.bmj.com\\\/bmj\\\/2020\\\/10\\\/07\\\/covid-19-modelling-the-pandemic\\\/\",\"url\":\"https:\\\/\\\/blogs.bmj.com\\\/bmj\\\/2020\\\/10\\\/07\\\/covid-19-modelling-the-pandemic\\\/\",\"name\":\"Covid-19: Modelling the pandemic - 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