The positive, negative, positive cases are almost certainly testing artifacts rather than reinfections though - they all seem to involve someone who was infecte

The positive, negative, positive cases are almost certainly testing artifacts rather than reinfections though - they all seem to involve someone who was infected testing positive after a relatively short time period, and researchers in countries like South Korea have found that the patients don't seem to have any viable virus or be able to infect others when they test positive for the second time: https://uk.reuters.com/article/us-health-coronavirus-southkorea-explain/explainer-south-korean-findings-suggest-reinfected-coronavirus-cases-are-false-positives-idUKKBN22J0HR https://uk.reuters.com/article/us-health-coronavirus-southko... As far as I know, their original claim is still true: there are zero confirmed reinfections with Covid-19.