Viral Hepatitis Laboratory,FIOCRUZ,Rio de Janeiro 21040360,Brazil;
Postgraduate Program in Pathology,Federal University of Ceará,Fortaleza 60020181,Ceara,Brazil;
Clementino Fraga Filho Hospital,Federal University of Rio de Janeiro,Rio de Janeiro 21040360,Brazil;
Nova Iguaçu General Hospital,Nova Iguaçu 26041061,Brazil;
Molecular Immunology Laboratory,Oswaldo Cruz Institute,Rio de Janeiro 21040360,Brazil;
Postgraduate Program in Medical Sciences,University of Fortaleza,Fortaleza 60811905,Ceará,Brazil;
Escola de Medicina e Cirurgia,Gaffrée&Guinle University Hospital,Federal University of Rio de Janeiro State,Rio de Janeiro 20270901,Brazil;
Institute of Communication and Information on Science and Technology in Health,FIOCRUZ,Rio de Janeiro 21040360,Brazil;
Dried blood spot; Electrochemiluminescence; Hepatitis B; Hepatitis C; Key populations; Diagnosis;