A COVID-19 vaccine developed by Moderna Inc. and the National Institutes of Health, shown here, is one of three vaccines in Phase 3 trials in the U.S. With development and testing underway, health officials are asking states to prepare for limited distribution of a potential vaccine as soon as this fall — though some experts say that

The CDC's planning guidance for states includes multiple scenarios for the rollout of a vaccine this year, including possibly having a limited number of doses available in October and November.

(Image credit: Hans Pennink/AP)



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