233 staff members at 2 San Francisco hospitals have tested positive, most in breakthrough Delta infections.

Vaccinations warded off severe Covid for most of the workers, who tested positive this month; two required hospitalization. New York Times By BY EDUARDO MEDINA from NYT U.S. https://ift.tt/3zXEkda
Hospitals, Vaccination and Immunization, Coronavirus (2019-nCoV), Disease Rates, Contact Tracing (Public Health)