NURISYAH, Sitti et al. Evaluation of an E. coli-expressed spike protein-based in-house ELISA system for assessment of antibody responses after COVID-19 infection and vaccination. Narra J, [S. l.], v. 5, n. 1, p. e1250, 2025. DOI: 10.52225/narra.v5i1.1250. Disponível em: https://www.narraj.org/main/article/view/1250. Acesso em: 3 apr. 2026.