this is very interesting
https://youtu.be/NQ1h33mPGuU
Japan has reached herd immunity
the reason their death rate is so low is that they dont shout in each
others faces & they have good ventilation - therefore they dont blast
each other with millions of virions - just a 100 virions for an
initial innoculum - mentioned at 15:00 on the video
there are 2 types of antibodies - IgM and IgG - IgM appear first and
last for 1 month approx - then the IgG antibodies start to be produced
(1 month maybe after initial exposure)
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