> You don’t need 100% efficacy to achieve herd immunity (obviously I’m not an epidemiologist and my terms are imprecise) if you have a sufficiently vaccinated p

> You don’t need 100% efficacy to achieve herd immunity (obviously I’m not an epidemiologist and my terms are imprecise) if you have a sufficiently vaccinated population. Treshold of herd immunity depends on transmitability. For delta variant, if r=6 estimates are true, you would need 100% of population vaccinated in last 5 months (because after that infection immunity drops too low).