Mix-and-match approach boosts immune response of AstraZeneca shot, study finds
The study, called Com-COV, compared mixed two-dose schedules of Pfizer and AstraZeneca vaccines.
Tue Jun 29 2021
AstraZeneca, Sputnik vaccines face hurdles if COVID shots become annual affair
Scientists raise concern over current vaccine shots that may lose potency if annual inoculations become necessary to fight new variants.
Fri Feb 26 2021