The new study conducted by Oxford university shows that Mixing doses of the Pfizer and AstraZeneca vaccines can generate a strong immune response against Covid 19. The study found that those who are given a dose of AstraZeneca followed by a dose of Pfizer four weeks later generated a better immune response.
Oxford developed the AstraZeneca vaccine, which is used in the U.K. In the U.S., three other Covid 19 vaccines are available: Moderna, Johnson & Johnson and Pfizer-BioNTech.The Oxford study used 830 volunteers, 50 years or older, in the U.K. to test four different vaccine combinations.
In May, the Com-Cov study revealed that mixing vaccines resulted in more frequent mild to moderate reactions, but these reactions were short-lived. Researchers are also testing Covid 19 vaccine Moderna and Novavax vaccines in a new study. Six new arms of the trial recruited approximately 175 candidates each, adding a further 1,070 people to the program.