Los Angeles County will again require masks be worn indoors in the nation’s largest county, even by those vaccinated against the coronavirus, while the University of California system also said Thursday that students, faculty and staff must be inoculated against the disease to return to campuses.The announcements come amid a sharp increase in virus cases, many of them the highly transmissible delta variant that has proliferated since California fully reopened its economy on June 15 and did away with capacity limits and social distancing.
The vast majority of new cases are among unvaccinated people.The rapid and sustained increase in cases in Los Angeles County requires restoring an indoor mask mandate, said Dr.