Pfizer's CEO says Covid vaccine effectiveness drops to 84% after six months - CNBC

The effectiveness of Pfizer's Covid-19 vaccine steadily declines over time, dropping to about 84% for vaccinated people about four to six months after getting their second dose, according to CEO Albert Bourla.

health officials over the need for a third Covid vaccine dose to boost immunity protection.

The efficacy after "four to six months was approximately 84%," Bourla said.

regulators about the benefits of a third Covid vaccine dose by mid-August, Bourla said.

While officials say the majority of Covid hospitalizations and deaths are in unvaccinated people, the delta variant is so contagious that vaccinated individuals can transmit the virus as easily as unvaccinated people, even in asymptomatic cases, CDC Director Rochelle Walensky said Tuesday.