reinfections

More than two-thirds of cases of the Omicron variant of COVID-19 are among people who have been reinfected with the virus, a new study said Wednesday. Imperial College London researchers reported that around…

Second bouts of COVID-19 are rare, though people 65 years and older may be at higher risk of reinfection than younger ones, a study from Denmark suggests. The first documented coronavirus reinfection was reported in August 2020,…