Sutandhio, S., Wihanto, L., Tedyanto, C. P., & Santoso, S. (2025). In Vitro Analysis of SARS-CoV-2 Variants that Caused Severe COVID-19 in the Elderly. Indonesian Journal of Tropical and Infectious Disease, 13(1), 10–16. https://doi.org/10.20473/ijtid.v13i1.65484