Poll: Unvaccinated Americans least concerned about Delta variant
(www.politico.com)
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A virus doesn't have a goal. Its is simply a "program" floating around until it enters a living cell and "hijacks" the cells' systems by incorporating its RNA/DNA into the host. Lethality decreases (the more lethal a virus, the more likely it kills its hosts and ends transmission to other hosts. The less lethal variants "survive" because they are weaker and DO NOT kill the host. Contagiousness and lethality are VERY different.