Pfizer’s child-sized vaccine fails to produce expected immunity in younger kids; company adds third dose to trials – CNN

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

Source: Pfizer’s child-sized vaccine fails to produce expected immunity in younger kids; company adds third dose to trials – CNN