Navigating the waves in Colombia: a cohort study of inpatient care during four COVID-19 waves David E. Rebellón-Sánchez; Tania M. Guzmán; Sarita Rodriguez; Julio Llanos-Torres; Daniela Vinueza; Eric Tafurt; Estefanía Beltrán; Álvaro Martínez; Fernando Rosso;

Assessment of initial SARS-CoV-2 seroprevalence in the most affected districts in the municipality of São Paulo, Brazil Beatriz Helena Tess; Celso Francisco Hernandez Granato; Maria Cecília Goi Porto Alves; Maria Carolina Tostes Pintão; Marcia Cavallari Nunes; Edgar Gil Rizzatti; Fernando de Castro Reinach;

SARS-CoV-2 testing disparities across geographical regions from a large metropolitan area in Brazil: Results from a web-based survey among individuals interested in clinical trials for COVID-19 vaccines Thiago S. Torres; Paula M. Luz; Lara E. Coelho; Cristina Jalil; Gisely G. Falco; Leonardo P. Sousa; Emilia Jalil; Daniel R.B. Bezerra; Sandra W. Cardoso; Brenda Hoagland; Claudio J. Struchiner; Valdilea G. Veloso; Beatriz Grinsztejn;