The Covid-19 Vaccine Rollout Faces a Two-Shot Problem

Millions of follow-up doses have been languishing in freezers, causing a massive logjam—and not everyone likes the ideas for a fix.

The Covid-19 Vaccine Rollout Faces a Two-Shot Problem
Millions of follow-up doses have been languishing in freezers, causing a massive logjam—and not everyone likes the ideas for a fix.
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