CDC’s Walensky Suggests Higher Bar May Be Needed For Fourth COVID Vaccine Shots

 
• By Sarah Karlin-Smith

Pfizer and Moderna have both indicated a fourth mRNA COVID vaccine may be needed. Companies may need to show waning protection against severe disease first.

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Vaccine makers might need to do more work to get a fourth COVID shot cleared than they did for their initial boosters. • Source: Alamy

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