Britain trial to test combining Pfizer and AstraZeneca vaccines in 2-shot
The trial will examine the immune responses of an initial dose of Pfizer vaccine followed by a booster of AstraZeneca's, as well as vice versa, with intervals of 4 and 12 weeks.
A health worker draws a dose of the AstraZeneca's coronavirus disease (COVID-19) vaccine, at the vaccination center in the Newcastle Eagles Community Arena, in Newcastle upon Tyne, Britain, January 30, 2021.(photo credit: REUTERS/LEE SMITH)ByREUTERS
