> which would imply half of the population has already contracted the virus, which we know from antibody testing is not the case. Antibodies disappear quickly

> which would imply half of the population has already contracted the virus, which we know from antibody testing is not the case. Antibodies disappear quickly so antibody studies aren't a perfect indicator of spread. See for example: > The UK study, meanwhile, suggested that antibodies could disappear completely within three months. The research tested more than 90 coronavirus patients for antibodies over 94 days. The results showed that three weeks after infection, just 60% of patients had developed a "potent" antibody response. In the weeks that followed, a mere 17% of those patients maintained that level of antibodies, The Guardian reported. In the other patients, antibody levels declined 23-fold or became undetectable within three months. https://www.businessinsider.com/coronavirus-antibodies-last-just-months-2020-7?r=US&IR=T https://www.businessinsider.com/coronavirus-antibodies-last-...