Therapy Areas: Vaccines
Study suggests two doses of Pfizer or AstraZeneca COVID-19 vaccines effective against Delta COVID-19 variant
22 July 2021 -

A new study has found that two doses of the Pfizer (NYSE:PFE) or AstraZeneca (LON:AZN) COVID-19 vaccine are nearly as effective against the highly transmissible Delta variant as they are against the previously dominant Alpha variant, Reuters news agency reported on Thursday.

The study, published in the New England Journal of Medicine on Wednesday, confirmed headline findings given by Public Health England in May 2021 and reiterated that one shot of the vaccines is not enough for high protection.

Results of the study indicate that two doses of Pfizer's shot were 88% effective at preventing symptomatic disease from the Delta variant, compared to 93.7% against the Alpha variant, broadly the same as previously reported.

Also, two shots of AstraZeneca vaccine were 67% effective against the Delta variant, up from 60% originally reported, and 74.5% effective against the Alpha variant, compared to an original estimate of 66% effectiveness.

The full study found that one dose of Pfizer's shot was 36% effective, and one dose of AstraZeneca's vaccine was around 30% effective.