A new study shows the Delta Covid-19 variant produced similar amounts of virus in vaccinated and unvaccinated people if they get infected — illustrating a key motivation behind the federal guidance that now recommends most fully vaccinated Americans wear masks indoors.
A new study shows the Delta Covid-19 variant produced similar amounts of virus in vaccinated and unvaccinated people if they get infected — illustrating a key motivation behind the federal guidance that now recommends most fully vaccinated Americans wear masks indoors.
