Pfizer COVID vaccine 91% effective for at least 6 months | CIDRAP (God and bad news – have to get another shot in September?)

The Pfizer/BioNTech COVID-19 vaccine is 91.3% effective up to 6 months after the second dose and 100% effective against severe disease as defined by the US Centers for Disease Control and Prevention (CDC), according to updated data today from the phase 3 trial.

Source: Pfizer COVID vaccine 91% effective for at least 6 months | CIDRAP