Barros, Aluísio J D, Cesar G Victora, Ana M B Menezes, Bernardo L Horta, Fernando C Barros, Fernando P Hartwig, Gabriel D Victora, et al. “Population-Level Seropositivity Trend for SARS-Cov-2 in Rio Grande Do Sul, Brazil”. Revista de Saúde Pública 55 (November 22, 2021): 78. Accessed May 7, 2024. https://www.revistas.usp.br/rsp/article/view/193411.