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 and dialysis: humoral response, clinical and laboratory impacts before vaccination Alanna Calheiros Santos, Vanessa Duarte da Costa, Lucas Lima da Silva, Juliana Custódio Miguel, Rodrigo Jardim, Alberto Martín Rivera Dávila, Vanessa Salete de Paula, Juliana Gil Melgaço, Barbara Vieira do Lago, Livia Melo Villar

SARS-CoV-2 infection in pregnant women and newborns in two maternity hospitals in Salvador-Bahia, Brazil Licia Maria Oliveira Moreira, Jesus Patiño, Patricia Ribeiro de Oliveira, Maria Heloina Moura Costa, Ana Cecilia Santiago, Gúbio Soares Campos, Silvia Inês Sardi, Carlos Menezes, Priscila Pinheiro Ribeiro Lyra, Eduardo Martins Netto