Suryanto, S. and Gugun, A.M. 2023. DIFFERENCES IN S-RBD ANTIBODY TITERS OF SARS-CoV-2 POST-VACCINATION AND POST-COVID-19 IN UMY EMPLOYEES THAT DO GENERAL MEDICAL CHECK UP AT AMC MUHAMMADIYAH HOSPITAL YOGYAKARTA. Cerdika: Jurnal Ilmiah Indonesia. 3, 7 (Jul. 2023), 651–656. DOI:https://doi.org/10.59141/cerdika.v3i7.637.