The resurgence of SARS-CoV-2 infection in a highly vaccinated health system workforce; vaccine effectiveness against infection was reduced from above 90% from March through June to 65% in July.

Resurgence of SARS-CoV-2 Infection in a Highly Vaccinated Health System Workforce – New England Journal of Medicine

Related:

Another study shows Pfizer mRNA vaccine immunity is reduced over time.

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

Commentary on Twitter (thread – click for more)

? NEW DATA?

1/ "Resurgence of SARS-CoV-2 Infection in a Highly Vaccinated Health System Workforce" published today in @NEJM details ↓ in vaccine effectiveness against INFECTION among @UCSDHealth employees – from 95%+ in the spring to 65% in July

?? https://t.co/wMgjoLgJzS pic.twitter.com/lgOwlEqUQG

— Christopher A. Longhurst (@calonghurst) September 1, 2021