Risk factors for severe COVID-19 infection in Brazilian children Jordana Vaz Hendler; Patricia Miranda do Lago; Gabriel Cardozo Müller; João Carlos Santana; Jefferson Pedro Piva; Liane Esteves Daudt;

Real-world accuracy of SARS-CoV-2 antigen detection compared with qPCR: A cross-sectional study in Toledo - PR, Brazil Carla Adriane Royer; Regis Goulart Rosa; Maicon Falavigna; Jaqueline Carvalho de Oliveira;

Demographic, epidemiological and clinical profile of patients with post-COVID syndrome followed at a teaching hospital in Brazil João Paulo Borges de Melo; Alex Eduardo da Silva; Leandro Resende Yamamoto; Taciana Fernandes Araújo Ferreira; Gustavo José Luvizutto; Fernando Freitas Neves; Kelly Cristina Santos; Roger Lopes Batista; Isabel Cunha Santos; Francielle Schiavoni; Mario León Silva-Vergara;