I’m considering about virus. In this type of parasite, when the number of infected people reaches a certain number, they become saturated and infectors decreases. One of the reason is that when the all host is killed, the parasite itself can’t survive, so the infectivity is suppressed. I wonder why they without thought function can make that judgment. And I guess that the difference of mortality in each country or district might be related to vaccination given during childhood or something. Anyways, I hope it’ll be elucidated and utilized in vaccine development in the future.

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