Washington: Two doses of the Pfizer or AstraZeneca vaccines are effective against the new delta COVID variant but not as effective as they are against the original, a study published in the US New England Journal of Medicine revealed.
Two doses of the Pfizer vaccine was 88 per cent effective against the delta virus versus 93.7% against the alpha strain, according to the study released on Wednesday, while AstraZeneca’s was 67% effective against the delta versus 74.5% against the original.
