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The American Journal of Tropical Medicine and Hygiene|June 1, 2021
Risk Factors for Death Among 120,804 Hospitalized Patients with Confirmed COVID-19 in São Paulo, BrazilPatricia Vieira da Silva, Silvano Barbosa de Oliveira, Juan José Cortez Escalante, et al.
Lancet Regional Health. Americas|March 14, 2025
Immunogenicity and reactogenicity of fractional vs. full booster doses of COVID-19 vaccines: a non-inferiority, randomised, double-blind, phase IV clinical trial in BrazilMarco Antonio Moreira Puga, Roberto Dias de Oliveira, Patricia Vieira da Silva, et al.
BMJ Public Health|July 7, 2025
Antispike IgG antibody decay after immunisation with fractional versus full booster doses of COVID-19 vaccines: a 6-month longitudinal analysis of the FRACT-COV trial in BrazilJuliana Barros Verruck, Marco Antonio Moreira Puga, Roberto Dias de Oliveira, et al.
The Lancet. Infectious Diseases|February 29, 2024
Effect of BCG vaccination against Mycobacterium tuberculosis infection in adult Brazilian health-care workers: a nested clinical trialPaulo Cesar Pereira Dos Santos, Nicole Louise Messina, Roberto Dias de Oliveira, et al.
The Lancet. Infectious Diseases|August 22, 2025
Effectiveness of the TAK-003 dengue vaccine in adolescents during the 2024 outbreak in São Paulo, Brazil: a test-negative, case-control studyOtavio T Ranzani, Felippe Lazar Neto, Lisany Krug Mareto, et al.
BMJ (Clinical Research Ed.)|August 21, 2021
Effectiveness of the CoronaVac vaccine in older adults during a gamma variant associated epidemic of covid-19 in Brazil: test negative case-control studyOtavio T Ranzani, Matt D T Hitchings, Murilo Dorion, et al.
Medrxiv : the Preprint Server for Health Sciences|January 6, 2022
Change in COVID-19 risk over time following vaccination with CoronaVac: A testnegative case-control studyMatt D T Hitchings, Otavio T Ranzani, Margaret L Lind, et al.
BMJ (Clinical Research Ed.)|June 13, 2022
Change in covid-19 risk over time following vaccination with CoronaVac: test negative case-control studyMatt D T Hitchings, Otavio T Ranzani, Margaret L Lind, et al.
Lancet Regional Health. Americas|August 13, 2021
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 studyMatt D T Hitchings, Otavio T Ranzani, Mario Sergio Scaramuzzini Torres, et al.
Scientific Reports|September 27, 2022
Serum biomarkers associated with SARS-CoV-2 severityFabiani de Morais Batista, Marco Antonio Moreira Puga, Patricia Vieira da Silva, et al.
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