3 ms·
Or until something like 95% of population has been infected and we know for sure that those who already had the disease can not spread it anymore.
by yoz-y 7y ago
Or until something like 95% of population has been infected and we know for sure that those who already had the disease can not spread it anymore.
- foobarbecue 7y agoHas this ever happened in humans? I haven't been able to find an example.
- deleted 7y ago[deleted]
- jimktrains2 7y agoIsn't this why there is a 1918-related flu outbreak every generation and why bubonic plauge used to recurved every generation because there aren't immune?
- nicoburns 7y agoI think bubonic plague is bacterial, and was solved with antibiotics.
- jimktrains2 7y agoIt doesn't matter that it's bacterial to have recurrences. Also, we never "solved" the plauge, but it died down a lot before antibiotics were even a thing.
- tzs 7y agoWhat about people born after that point? As immune people die over time from other causes, and as people are born without immunity, the percent of the population with immunity from having had it falls. Non-vaccine acquired herd immunity is temporary.
- oezi 7y agoStatistically a disease reaches herd immunity if everyone except 1 / R0 are infected. For a disease with R0 of 3 (such as covid) this would be 66%. To explain: If two out of three are immune then a disease which usually infects three people will run out of steam.