
Pfizer Says COVID-19 Vaccine Efficacy Weakens Over Time
Published on September 15, 2021
Pfizer said that booster doses should be given to all people aged 16 and older six months after they received their second dose of the mRNA vaccine.

Pfizer said that booster doses should be given to all people aged 16 and older six months after they received their second dose of the mRNA vaccine.