Repeated Covid infections increase risk of serious health problems, study finds

Repeated Covid infections increase risk of serious health problems, study finds: People who have had Covid more than once are two or three times more likely to have a range of serious health problems than those who have only had it once, the first major study on the subject said Thursday. Multiple infections have surged as the pandemic rumbles on and the virus mutates into new strains, but the long-term health effects of reinfection have not been clear. The US researchers said their new study published in the Nature Medicine...