Retnaningsih, Ekowati, et al. “Comparison of Anti-SARS-CoV-2 IgG Seropositivity Among Vaccinated, Unvaccinated, and COVID-19 Survivor Individuals: A Cross-Sectional Study in Palembang, Indonesia”. Narra J, vol. 5, no. 3, Sept. 2025, doi:10.52225/narra.v5i3.2890.