But unvaccinated people with a past infection were a close second....
“ The bottom-line message is that from symptomatic COVID infection you do generate some immunity, ” said immunologist E. John Wherry of the University of Pennsylvania....
Plus, there are too many unknowns to rely only on a past infection, especially one from long ago, said immunologist Ali Ellebedy at Washington University in St....
综合
洛杉矶时报-世界与民族
2022-01-19 00:00:00.0
