Turtleb wrote:
Precious Roy wrote:
If Sweden has herd immunity with about 8500 cases per mil, why doesn't Texas have it with 21,000 cases per mil? Or Mississippi with 26,000 cases per mil? Why is Brazil still seeing high levels of infection after two months when it is at 17,000 cases per mil? And the foregoing states/country are far less diligent than Sweden when it comes to testing, meaning that their outbreaks are far more widespread than the official data.
The answer, of course, is that Texas, for example, does have herd immunity, at least
in the big cities now. That is why cases and deaths are going down--it isn't
any change in behavior over that time.
Magic number seems to be about 20% of the population affected for herd
immunity. What is the overall mortality for covid? Estimates I've seen
are like 0.3%.
Deaths are better to look at at, since despite categorization issues, if there is
a death at least it will be counted, whereas if you don't get tested you aren't.
0.2 x 0.003 x 1000000 = 600 per million deaths should be good for herd
immunity. Of course that number will shift a lot if the old folks get, or don't
get, it disproportionately, but that is the ballpark.
Sweden is at 575.
Texas is about 400, ballpark. By the time things are all said
and done will probably end up about like Sweden.
New York, with the idiot mayor and governor, is ~1700!!!
Mississippi is on the way down, so likely has herd immunity,
but is at about 750. First guess would be something like obesity
(isn't something like 40% of the population obese in that part
of the country?) but I haven't looked into it.
Brazil is at about 550 and does look like it is turning over.