What does it mean that someone has caught COVID-19 for a second time?
Going back to the early weeks of the infection in China, there were reports that some people had been reinfected with the virus behind COVID-19 after apparently recovering from the disease. Some of the early numbers suggested that the reinfection rate was as high as 15%, but that was, and remains, pretty definitely untrue. These early results came from people who had received a series of tests and at some point tested negative before testing positive again.