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Mar 31, 2020
9:01:41am
Resurgens Truly Addicted User
Those aren't in widespread circulation and actually cause more severe disease
than the current coronavirus, which is part of why they weren't as successful at creating a pandemic (severely symptomatic patients are easier to identify and isolate). There are 4 coronaviruses that circulate widely and have for years, responsible for 1/3 of common colds.

Resurgens
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Harrison0Yfan
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Resurgens
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