Last September, in the Italian seaside province of Chieti, a 41-year-old Ukrainian man and his friend went for a dip in the sea. Sixteen hours later, he was dead from drowning. A sad tale, but no medical mystery. Except for the fact that, for nearly six full weeks after his death, his body tested positive no fewer than 28 times for COVID-19 – a discovery that the researchers involved say is of “fundamental importance for pathologists.” Even weirder is the fact that, before death, the man had been “completely asymptomatic,” the team wrote in a study now published in the...