Pfizer's vaccine initially protects people 100% of the time against hospitalization, but that falls to low 90% and mid-to-high 80% after 6 months, Bourla said.
that has yet to be peer reviewed. It comes as the drugmaker clashes with U.S. health officials over the need for a third Covid vaccine dose to boost immunity protection.
Pfizer sells $7.8 billion in Covid shots in the second quarter, raises 2021 guidance on vaccine sales "The good news is that we are very, very confident that a third dose, a booster, will take up the immune response to levels that will be enough to protect against the delta variant," the executive added, referring to the highly contagious virus strain that's dominant in the U.S. and other countries around the globe. It's not uncommon for vaccines to decline in effectiveness over time, Bourla stressed, adding there's precedent for three-dose vaccines for other diseases.
Earlier this month, when Pfizer first announced its plans, the Food and Drug Administration and the Centers for Disease Control and Prevention
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