Lengthy clinical trials to test vaccines modified for variants won’t be necessary, FDA says


If the novel coronavirus mutates such that current COVID-19 vaccines are no longer effective at fighting the virus, researchers will have to modify the vaccines. 

But new guidelines issued by the Food and Drug Administration (FDA) indicate that long, extensive clinical trials may not be necessary to test the modified vaccines. Rather, the modified vaccines can be tested in small-scale trials like those conducted to develop the flu vaccine every year, The New York Times reported.


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