Some of the cases were asymptomatic, most involved mild to moderate symptoms and only two required hospitalization, officials said. The infections were determined to be Delta-related because most samples in San Francisco were tested for the variant, which is now dominant in the city.
More than 200 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.
“We’re concerned right now that we’re on the rise of a surge here in San Francisco and the Bay Area,” Dr. Day said. “But what we’re seeing is very much what the data from the vaccines showed us: You can still get Covid, potentially. But if you do get it, it’s not severe at all.”