Vaccine maker Pfizer said Friday that trials of its vaccine in children ages 2 to 5 show that it did not provide the expected immunity in kids this age, and it is adding a third dose to the regimen.

Pfizer/BioNTech has initiated its application to the US Food and Drug Administration for full FDA approval of its Covid-19 vaccine for people ages 16 and older, the companies said Friday. This is the ...

PHILADELPHIA -- Pfizer and BioNTech said Tuesday they have submitted Covid-19 vaccine data on children ages 5 to 11 to the US Food and Drug Administration for initial review, but are not yet seeking ...

A third dose of the Pfizer/BioNTech COVID-19 vaccine can "strongly" boost protection against the delta variant -- beyond the protection afforded by the standard two doses, suggests new data released ...