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Originally Posted by
SheltonChoked
Is herd immunity without a vaccine, possible? Wouldn't that be /have been the case for Measles, mumps, chickenpox, smallpox, diphtheria, pertussis, typhoid, Yellow Fever, Malaria, Black Death, Plague etc?
Can't remember where I read it, but read something the other day saying it depends on the Ro and whether repeat infections are possible. For measles (I think; may have been mumps or chikcen pox), the guy calculated herd immunity would requires something like 90-95% of the population to have been infected and get immunity b/c the Ro was so high. With what they think the Ro is for COVID, he calculated that something like 70% of the population would have to get it.
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