Having trouble understanding SF's strategy around masking—not sure what "slowing the spread" achieves this time absent other programs. Help me steel-man?
Buying time for vaccination? 84% eligible got 1+ vaccine; ~3wks to rise from 83%; now 500 ppl/day of 126k eligible. :/
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Maybe: buying time for the ~10% of vaccinated residents who have only received one dose of their two-dose series? That could have a bigger impact in the short/medium-term than waiting for more 0->1 recipients.
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My understanding is that the most important thing now is to form heard immunity on a large scale before the virus mutates far enough that our vaccines stop being effective. A UK study found Pfizer to be a little less effective against the Delta variant.
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AFAICT herd immunity is not achievable! But I found this quite persuasive:
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Very interesting! CDC model's finds that vaccinated masking is sufficient to drop R (currently ~1.34) < 1 at our vaccination coverage % (but unvaccinated masking is not). This is a much greater effect than I expected and justifies the policy if true. washingtonpost.com/context/cdc-br (p20)
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