Population-level seropositivity trend for SARS-Cov-2 in Rio Grande do Sul, Brazil by Aluísio J D Barros, Cesar G Victora, Ana M B Menezes, Bernardo L Horta, Fernando C Barros, Fernando P Hartwig, Gabriel D Victora, Luis Paulo Vidaletti, Mariângela F Silveira, Marilia A Mesenburg, Nadège Jacques, Cláudio J Struchiner, Flávia Roberta Brust, Marinel M Dall'Agnol, Ana Paula Longaray Delamare, Carlos Henrique R François, Maria Letícia R Ikeda, Débora C P Pellegrini, Cézane Priscila Reuter, Shana G da Silva, Odir A Dellagostin, Pedro C Hallal

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