“These data suggest that reinfection with SARS-CoV-2 is rare and occurs in less than 1% of individuals...”











https://twitter.com/EricTopol/status/1372329717928325125 …
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What we really need is a longitudinal cohort of the same individuals that has been followed over time, with a non-probabilistic sampling method to minimize selection bias, and who are tested (say) twice a month regardless of symptoms. But that is a really hard ask
So I'm not saying the researchers could've done a better study using the data at hand, because I love this piece of research, but that to really answer the question we kind of need a different study design altogether
Selection bias? They screened the whole country by providing easy/free access to testing for a year. I’m not trying disagree with you; just wondering what would improve the study?
Sure, but people with no symptoms are less likely to get tested. Same with people who have had COVID-19 before. They didn't screen the country, exactly, which means that the bias is hard to exclude
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