RIO DE JANEIRO, BRAZIL - The combination of AstraZeneca's first dose of Covid-19 vaccine and Pfizer's second dose increased neutralizing antibody levels six-fold compared with two doses of AstraZeneca, a study conducted in South Korea showed.
The study, published Monday, 26, involved 499 volunteers - all health professionals. About 100 people received the vaccine combination, 200 received Pfizer's two doses, and 199 were inoculated with two injections from AstraZeneca.
All subjects showed neutralizing antibodies that prevent the virus from entering cells and replicating. The result of the mixed vaccination regimen showed similar levels of neutralizing antibodies in . . .