RT @Bob_Wachter: Ruh roh (at least in SF): asymptomatic test positivity rate @UCSFHospitals now 5% (was ~2% last month). While not a perfec…
RT @Bob_Wachter: Ruh roh (at least in SF): asymptomatic test positivity rate @UCSFHospitals now 5% (was ~2% last month). While not a perfec…