Estudo de caso-controle | 3 doses de vacinas de mRNA foram associadas com redução nas infecções pelas variantes Ômicron e Delta do SARS-CoV-2 em comparação com 2 doses ou nenhuma vacinação.

Association Between 3 Doses of mRNA COVID-19 Vaccine and Symptomatic Infection Caused by the SARS-CoV-2 Omicron and Delta Variants – JAMA

Editorial: Booster Vaccination to Prevent COVID-19 in the Era of Omicron: An Effective Part of a Layered Public Health Approach – JAMA

Comentários: New data show booster doses protect against Omicron – CIDRAP

Boosters provide the best protection against Omicron variant, CDC studies show, raising new questions about what it means to be fully vaccinated – CNN

Estudos do CDC relacionados:

COVID-19 Incidence and Death Rates Among Unvaccinated and Fully Vaccinated Adults with and Without Booster Doses During Periods of Delta and Omicron Variant Emergence — 25 U.S. Jurisdictions, April 4–December 25, 2021 – CDC Morbidity and Mortality Weekly Report

Effectiveness of a Third Dose of mRNA Vaccines Against COVID-19–Associated Emergency Department and Urgent Care Encounters and Hospitalizations Among Adults During Periods of Delta and Omicron Variant Predominance — VISION Network, 10 States, August 2021–January 2022 – CDC Morbidity and Mortality Weekly Report

Comentário no Twitter

Study suggests receipt of 3 doses of mRNA #COVID19 vaccine, vs 2 doses or being unvaccinated, was associated with protection against both the Omicron and Delta variants; higher odds ratios for Omicron suggest less protection for Omicron than for Delta. https://t.co/kOZh0fq5TL

— JAMA (@JAMA_current) January 21, 2022