Researchers to examine whether mixing vaccines might give longer-lasting immunity against virus
A major UK study examining whether Covid vaccines can be safely mixed with different types of jabs for the first and second doses is to be expanded.
Researchers running the Com-Cov study, launched in February to investigate alternating doses of the Oxford/AstraZeneca and Pfizer vaccines for the first and second doses, will now include a shot of Moderna or Novavax.
