<div dir="ltr"><div class="gmail_default" style="font-family:comic sans ms,sans-serif;font-size:large;color:#000000">bill w  From Nature:</div><div class="gmail_default" style="font-family:comic sans ms,sans-serif;font-size:large;color:#000000"><br></div><div class="gmail_default" style="font-family:comic sans ms,sans-serif;font-size:large;color:#000000"><table role="presentation" cellspacing="0" cellpadding="0" border="0" align="center" width="100%" class="gmail-m_3951659767603475354email-container" style="color:rgb(34,34,34);font-family:Arial,Helvetica,sans-serif;font-size:small;max-width:600px;border-spacing:0px;border-collapse:collapse;table-layout:fixed;margin:0px auto"><tbody><tr><td class="gmail-m_3951659767603475354content-block" style="font-family:Georgia,"Times New Roman",times,serif;line-height:1.5;padding:0px 20px;font-size:18px;letter-spacing:0.2px"><h2 style="font-size:24px;margin:0px;line-height:1.3"><a href="https://nature.us17.list-manage.com/track/click?u=2c6057c528fdc6f73fa196d9d&id=2bbba47199&e=d520e39c16" target="_blank" style="text-decoration-line:none"><br class="gmail-Apple-interchange-newline">Natural COVID immunity might not last</a></h2><p style="margin:16px 0px 10px;line-height:1.5;letter-spacing:0.2px">Unvaccinated people who have been infected with SARS-CoV-2 are <a href="https://nature.us17.list-manage.com/track/click?u=2c6057c528fdc6f73fa196d9d&id=efe1b3a19f&e=d520e39c16" target="_blank" style="text-decoration-line:none">at risk of reinfection within a couple years</a>, according to a model based on knowledge of SARS-CoV-2 and other coronaviruses. Researchers combined long-term data for ‘endemic’, or continually circulating, coronaviruses that can cause the common cold with genetic data from SARS-CoV-2 and the closely related coronaviruses SARS-CoV and MERS-CoV. The results suggest that the average reinfection risk rises from about 5% at 4 months after initial infection to 50% by 17 months. “Immunity is relatively short-lived,” says bioinformatician Jeffrey Townsend. “You should still get vaccinated even if you got infected.”</p></td></tr></tbody></table></div></div>