Just as blood donors are not ideal to measure seroprevalence (blood donors are very public-health minded, so surely more likely to be vaccinated), I wonder if voluntary testing in unvaccinated people is ideal to measure reinfection risk. My two cents on the preprint of the day.
qui dit que ceux qui donnent leur sang pourraient être plus souvent vaccinés ... ça pourrait etre interessant de tester , meme si bien sur l'échantillon sera très réduit.