Study: Two Pfizer, AstraZeneca Shots Effective against Delta Variant

Two shots of Pfizer or AstraZeneca vaccine are highly effective against the latest Delta COVID-19 variant, a new study published on Wednesday showed.

Although various experts announced previously that all approved vaccines are effective against the highly transmissible strain, scientists showed that one shot of the vaccine is not enough for securing from the variant. The two shots are required.

Published in the New England Journal of Medicines, it asserted that the high efficiency of both two-shot vaccines against the Delta strain, and it is based on "real-world data," according to Reuters.

The two-dose-Pfizer was effective by 88% against Delta strain, compared to 93.7% against the earliest variants of COVID-19, Alpha strain.

On the other hand, the study revealed that two shots of AstraZeneca were effective by 67% against the Delta variant, compared to 74.5% against the Alpha variant.