Can someone smart explain to me how ANY annual virus stops before it infects most of the planet?
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People build immunity? Or they hit people who turn out to be immune.
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@ScottAdamsSays There seem to be three paths: 1. Most common: Virus becomes far less deadly and we live w/ the losses (1918 flu -> 2009 Swine Flu) 2. ~500 years: Virus mutates to super deadly and kills itself off (Black Death, Plague of Justinian) 3. Vaccines & mass innoculation
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