UCSF's Dr. Bob Wachter Says He's Masking Up Again, Says 1 in 30 San Franciscans Has COVID and Doesn't Know It

COVID Twitter sage Dr. Bob Wachter says there's a lot of Covid out there in San Francisco, encouraging masking up indoors as he estimates that one out of every 30 asymptomatic people in SF are indeed positive for COVID-19.

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