Tweet from Bob_Wachter at August 02, 2021 at 10:43PM

Alas, the surge in San Francisco, which has 70% of population fully vaccinated & 76% w/ at least one shot, illustrates that even w/ ~80% immune (giving credit for prior infections), we’re not at herd immunity. Goal w/ Delta is to get immunity as high as possible. Every bit helps. https://t.co/TWWSKWC5GI

— Bob Wachter (@Bob_Wachter)
Aug 3, 2021

from http://twitter.com/Bob_Wachter