Roberto Dias de Oliveira

Effectiveness of the CoronaVac vaccine in older adults during a gamma variant associated epidemic of covid-19 in Brazil: test negative case-control study

Otávio T. Ranzani, Matt D. T. Hitchings, Murilo Dorión et al. · BMJ · 2021 · 342 citations · Full text

Veterinary Medicine, Infectious Diseases, Preventive Medicine +17

Effectiveness of CoronaVac among healthcare workers in the setting of high SARS-CoV-2 Gamma variant transmission in Manaus, Brazil: A test-negative case-control study

Matt D. T. Hitchings, Otávio T. Ranzani, Mario Torres et al. · The Lancet Regional Health - Americas · 2021 · 170 citations · Full text

Veterinary Medicine, Infectious Diseases, Preventive Medicine +17

Randomized Trial of BCG Vaccine to Protect against Covid-19 in Health Care Workers

Laure F. Pittet, Nicole L. Messina, Francesca Orsini et al. · New England Journal of Medicine · 2023 · 117 citations · Full text

Veterinary Medicine, Immunology, Infectious Diseases +13

Effectiveness of an inactivated Covid-19 vaccine with homologous and heterologous boosters against Omicron in Brazil

Otávio T. Ranzani, Matt D. T. Hitchings, Rosana Leite de Melo et al. · Nature Communications · 2022 · 115 citations · Full text

Veterinary Medicine, Immunology, Infectious Diseases +17

Effectiveness of CoronaVac among healthcare workers in the setting of high SARS-CoV-2 Gamma variant transmission in Manaus, Brazil: A test-negative case-control study

Matt D. T. Hitchings, Otávio T. Ranzani, Mario Torres et al. · medRxiv · 2021 · 95 citations · Full text

Veterinary Medicine, Infectious Diseases, Preventive Medicine +17