Frequencies of genetic variants of the Rh, Kell, Duffy, Kidd, MNS and Diego systems of northwest Rio Grande do Sul, Brazil Scheila da Silva Soares; Josiane Rodrigues Aquino; Francini Petrolli; Tiago Bittencourt de Oliveira; Silvana Almeida; Marilu Fiegenbaum;

Frequency of antigen Dia on the blood donor population of the Hemocenter coordinator of the Hemopa Foundation Adna dos Santos Caldas; Bruno Costa dos Santos; Maurício Koury Palmeira; Fabiana Regina Ribeiro Carvalho; Carlos Eduardo de Melo Amaral;

Outcomes and vaccination patterns against COVID-19 in a cohort of sickle cell disease patients in the state of Rio de Janeiro Claudia de Alvarenga Maximo; Jorge Francisco da Cunha Pinto; Fabiana Canedo Pinto; Patrícia Brasil;