2 documents found, page 1 of 1
Time-dependent decay of detectable antibodies against SARS-CoV-2: A comparison ...
Silveira,Mariangela F; Mesenburg,Marilia A; Dellagostin,Odir A; Oliveira,Natasha R de; Maia,Mara AC; Santos,Francisco D; Vale,André; Menezes,Ana M BABSTRACT Background: Large-scale epidemiological studies of seroprevalence of antibodies against SARS-CoV-2 often rely on point-of-care tests that provide immediate results to participants. Yet, little is known on how long rapid tests remain positive after the COVID-19 episode, or how much variability exists across different brands and even among batches of the same test. Methods: In November 2020, we assessed ...
Population-level seropositivity trend for SARS-Cov-2 in Rio Grande do Sul, Brazil
Barros,Aluísio J D; Victora,Cesar G; Menezes,Ana M B; Horta,Bernardo L; Barros,Fernando C; Hartwig,Fernando P; Victora,Gabriel D; Vidaletti,Luis PauloABSTRACT OBJECTIVE To describe the evolution of seropositivity in the State of Rio Grande do Sul, Brazil, through 10 consecutive surveys conducted between April 2020 and April 2021. METHODS Nine cities covering all regions of the State were studied, 500 households in each city. One resident in each household was randomly selected for testing. In survey rounds 1–8 we used the rapid WONDFO SARS-CoV-2 Antibody Tes...