Delta’s extreme transmissibility negates some of the community-level protection that vaccines offer. If no other precautions are taken, Delta can spread through a half-vaccinated country more quickly than the original virus could in a completely unvaccinated country. It can even cause outbreaks in places with 90 percent vaccination rates but no other defenses.
This is disheartening. Also, science writer Ed Yong is a national treasure.
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