“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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Because people choose themselves whether to get tested. While there may not have been a direct monetary cost, testing is certainly not without secondary costs including time, effort, discomfort, etc...
But if the barriers to access testing are extremely low, people will seek tests after close calls/suspected exposures even without symptoms?
They will be more likely to seek testing than if there's a monetary cost, but the potential for bias is certainly there. Even in vast studies that offer free tests (i.e. ENE-COVID) AND follow people up with multiple phone calls 20-30% of people don't do it
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