Following the news this week of what appears to have been the first confirmed case of a Covid-19 reinfection, other researchers have been coming forward with their own reports. One in Belgium, another in the Netherlands. And now, one in Nevada. What caught experts’ attention about the case of the 25-year-old Reno man was not that he appears to have contracted SARS-CoV-2 a second time. Rather, it’s that his second bout was more serious than his first. … researchers are stressing this is not a sky-is-falling situation or one that should result in firm conclusions.