At the end of July, Pfizer and BioNTech announced findings that four to six months after a second dose, their vaccine's efficacy dropped to about 84%. Bourla was quick to promote a third dose after the discouraging news, saying he was "very, very confident" that a booster would increase immunity levels in the vaccinated.
from Section Page News - Modern Healthcare https://ift.tt/3sdmDni
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