(Al Jazeera) – Two doses of Pfizer shot 88 percent effective at preventing the Delta variant while two doses of AstraZeneca are 67 percent effective.
Two doses of Pfizer or AstraZeneca’s COVID-19 vaccine are nearly as effective against the highly transmissible Delta coronavirus variant as they are against the previously dominant Alpha variant, according to a new study.
Research published in the New England Journal of Medicine on Wednesday showed the vaccines were highly effective against the Delta variant, now the dominant strain worldwide, provided a person had received two shots.
The study confirms headline findings given by Public Health England (PHE) in May about the efficacy of COVID-19 vaccines made by Pfizer-BioNTech and Oxford-AstraZeneca based on real-world data.
Wednesday’s study found that Pfizer was 88 percent effective at preventing symptomatic disease from the Delta variant with both doses, compared with 93.7 percent against the Alpha variant, broadly the same as previously reported.
Two shots of AstraZeneca vaccine were 67 percent effective against the Delta variant, up from 60 percent originally reported, and 74.5 percent effective against the Alpha variant, compared with an original estimate of 66 percent effectiveness.