3 ms·
because there is enough people who are resistant in the population that virus can no longer spread
by qaq 6y ago
because there is enough people who are resistant in the population that virus can no longer spread
- sp332 6y agoI thought herd immunity required >90% of people to be resistant, but I guess that's only true for very contagious stuff like measles. According to https://en.wikipedia.org/wiki/Herd_immunity#Mechanics https://en.wikipedia.org/wiki/Herd_immunity#Mechanics COVID-19 might only need 30% of the population to be resistant if it has an R0 of 1.4, or 75% if the R0 is 3.9. It's still a good chunk of the population but it's a lot different than I thought.