Pfizer is about to seek US authorisation for a third dose of its Covid-19 vaccine, saying that another shot within 12 months could dramatically boost immunity and maybe help ward off the latest worrisome coronavirus mutant.
Pfizer is about to seek US authorisation for a third dose of its Covid-19 vaccine, saying that another shot within 12 months could dramatically boost immunity and maybe help ward off the latest worrisome coronavirus mutant.
