‘Real world’ study by CDC shows Pfizer and Moderna vaccines were 90% effective

‘Real world’ study by CDC shows Pfizer and Moderna vaccines were 90% effective – STAT

Original Study: Interim Estimates of Vaccine Effectiveness of BNT162b2 and mRNA-1273 COVID-19 Vaccines in Preventing SARS-CoV-2 Infection Among Health Care Personnel, First Responders, and Other Essential and Frontline Workers — Eight U.S. Locations, December 2020–March 2021 – Centers for Disease Control and Prevention

Commentary on Twitter (thread – Click for more)

Prospective study in the US finds mRNA vaccine efficacy against SARS-CoV-2 infection (symptomatic or not) of 90% (CI: 68–97) after 2 doses, & 80% (CI: 59–90) after 1 dose. (Wide CI because few people got infected)…1/2 https://t.co/RSf3xFtL29 HT @HelenBranswell

— Hilda Bastian, PhD (@hildabast) March 29, 2021