NEED MORE NUANCE—“Vaccines work” against the #DeltaVariant, yes—100% true. But it hides a lot of nuance—while vaccines protect YOU a lot if you get it, it will still allow virus to transmit & affect other susceptible—until hit higher vaxxed herd threshold (~85% for Delta)—Mask!🧵
https://twitter.com/michaelzlin/status/1409707511519748102
2) key issue is that while you’re personally protected if 2-dose vaccinated (60% AZ & 79-88% Pfizer efficacy, 94% hospitalization), the much higher transmission (2x faster transmissibility than old) means a higher herd level needed to stop #DeltaVariant from hitting others.
https://twitter.com/michaelzlin/status/1409700004705435649
3) Singapore Delta outbreak proves it—vaccinated still transmitted. In this #DeltaVariant cluster alone, among 29 vaccinated who were infected, 21 transmissions events were between vaccinated-to-vaccinated or vaccinated-to-unvaccinated. That is a lot! 
4) this is why both WHO and Los Angeles both recommends vaccinated still mask, because they can still shed viruses with the more transmissible #DeltaVariant with higher viral load per person that can transmit in 5-10 seconds if unlucky.
https://twitter.com/drericding/status/1409686190073126915
5) “near 100% household transmission” with #DeltaVariant seen in Australia 🇦🇺—one person brings it in, everyone gets it. This is why we need to stop every single chain of transmission with added masks.
https://twitter.com/drericding/status/1410126839801069570
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