Meeraus W, Stuurman AL, Durukal I, Conde-Sousa E, et al. COVID-19 vaccine booster doses provide increased protection against COVID-19 hospitalization compared with previously vaccinated individuals: Interim findings from the REFORCO-Brazil real-world effectiveness study during Delta and Omicron. Vaccine 2023 Sep 11:S0264-410X(23)01051-4. doi: 10.1016/j.vaccine.2023.
PMID: 37704499