Seroprevalence of anti-SARS-CoV-2 in patients with hepatitis B and C: a pre-vaccination study Lucas Lima da Silva; Lia Laura Lewis-Ximenez; Mônica de Avelar Figueiredo Mafra Magalhães; Vanessa Salete de Paula; Livia Melo Villar;

Seroprevalence of viral transfusion transmissible infections (HBsAg, anti-HCV, anti-HIV, Syphilis) and coinfection among healthy volunteer blood donors during 5-years in Luanda, Angola¿ Angelina Edna Quintas; Cláudia Camila Dias; Adis Del Carmen Cogle; Lemuel Cordeiro; António Sarmento;

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;