[Preprint] Pfizer vs. Moderna COVID-19 vaccine effectiveness against the Delta variant in Qatar – Effectiveness against symptomatic disease due to Delta was 53.5% for Pfizer and 84.8% for Moderna; effectiveness against severe disease due to Delta was 89.7% for Pfizer and 100.0% for Moderna.

BNT162b2 and mRNA-1273 COVID-19 vaccine effectiveness against the Delta (B.1.617.2) variant in Qatar – medRxiv

Related:

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

Commentary on Twitter

New and important data on Delta breakthrough infections, large Qatar experience and follow-up of > 1.2 million vaccinees https://t.co/2ye1Kz9OPV
2-doses vaccine effectiveness vs infections
Pfizer 53.5%
Moderna 84.8%
Either 57.2%
(replicates gap of recent Mayo Clinic study) pic.twitter.com/ghWuWbYPLH

— Eric Topol (@EricTopol) August 11, 2021