Study shows AstraZeneca and Pfizer vaccines are effective against Delta variant, but both doses are needed.

Effectiveness of Covid-19 Vaccines against the B.1.617.2 (Delta) Variant – New England Journal of Medicine

Commentaries: Study Finds Pfizer And AstraZeneca Vaccines Effective Against The Delta Variant — As Long As You Get Both Doses – Forbes AND Pfizer’s COVID-19 vaccine works very well against the Delta variant — but only after 2 doses – Insider

Related: [Preprint] 2 doses of Covid vaccines (Pfizer-BioNTech or Oxford-AstraZeneca) highly effective against hospitalization from Delta variant. AND Reduced sensitivity of SARS-CoV-2 variant Delta to antibody neutralization. AND Should I get my second AstraZeneca dose? Yes, it almost doubles your protection against Delta.

Commentary on Twitter

Public Health England's test-negative case-control study for Delta variant now in NEJM: over 14,000 people with Alpha, over 4,000 with Delta https://t.co/3l1QhKeXBT
Vax effectiveness against testing positive for Delta after 2 doses:
– BNT-Pfizer 88.0% (85-90)
– AZ 67.0% (61-72) pic.twitter.com/9UFy6CLSWw

— Hilda Bastian, PhD (@hildabast) July 21, 2021