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1. Both MA and VT target 80% vaccination rate in schools to remove mask mandates. Let’s be clear that this isn’t about herd immunity. For one, 80% doesn’t get you there - if R0 = 6 for delta and vaccine efficacy is 90% (both generous assumptions), it would be 92.5%.
2. Also, a school isn’t a “herd” (though it sometimes feels like one). Students and staff go home and interact with people outside of school.
3. Pure speculation, but I would guess that 80% just felt like a reasonable target consistent with overall vaccination rates. And therefore unmasking is a “prize” for schools that hit the target.
