Mix-match method boosts immune response of AstraZeneca jab: Study

A mixed schedule of vaccines where a shot of Pfizer’s COVID-19 vaccine is given four weeks after an AstraZeneca shot will produce better immune responses than giving another dose of AstraZeneca, according to a new study. The Oxford University study, called Com-COV, compared mixed two-dose schedules of Pfizer and AstraZeneca vaccines, and found that in any combination, they produced high concentrations of antibodies against the coronavirus spike protein.