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

Abstract
MRNA COVID-19 vaccine effectiveness against SARS-CoV-2 infection was 90% for full immunization (≥14 days after second dose) and 80% for partial immunization (≥14 days after first dose but before second dose) in real-world conditions.