According to Wednesday's study, Pfizer's two-dose syringe dose was 88% for symptomatic disease prevention in delta and 93.7% in alpha, broadly in line with previously reported
Two doses of COVID-19 vaccine from Pfizer or AstraZeneca were almost as effective against the highly contagious delta varient of coronavirus as against the previously dominant alpha varient, according to a study published Wednesday.
Officials say the vaccine is very effective against the Delta variant, which is the dominant vareint worldwide today, but the study confirmed that a single dose of the vaccine was not enough to maintain a high level of protection.
The study, published in the New England Journal of Medicine, confirms Public Health England published in May on the efficacy of Pfizer-BioNTech and Oxford-AstraZeneca Covid-19 vaccines based on real data.
According to Wednesday's study, Pfizer's two-dose syringe dose was 88% for symptomatic disease prevention in delta and 93.7% in alpha, broadly in line with previously reported.
The two AstraZeneca vaccines were 67% effective against the delta variant, 74.5% against the alpha variant, compared with the originally reported 60%, and the baseline effect was 66%.
"Only modest differences in vaccine effectiveness were noted with the Delta variant as compared with the Alpha variant after the receipt of two vaccine doses," Public Health England researchers mentioned in the study.
Israeli data show that protection against serious diseases remains high, but Pfizer's immunizations against symptomatic diseases are less effective. PHE previously stated that the first dose of both vaccines was approximately 33% effective against the symptomatic disease of the Delta variant.
The full study, published Wednesday, found that a single dose of Pfizer injection was 36% effective, while a single dose of AstraZeneca vaccine was about 30% effective.
"Our finding of reduced effectiveness after the first dose would support efforts to maximise vaccine uptake with two doses among vulnerable groups in the context of circulation of the Delta variant," the authors of the study stated.
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