What Will Trigger Modification Of COVID-19 Vaccines?

 
• By Brenda Sandburg

US FDA’s advisory committee members question when it will be clear current vaccines are not providing sufficient protection and express concern about the time it will take to change their composition given the need for clinical data to gain authorization.

Rabbit hole
US FDA advised not to go down a rabbit hole in deciding when to modify COVID-19 vaccines • Source: Alamy

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