Adekayanti, P., Subronto, Y.W. and Ahmad, R.A. 2022. COVID-19 serological epidemiology study at the IG Supermarket cluster in the Special Region of Yogyakarta. BKM Public Health and Community Medicine. 38, 03 (Mar. 2022), 69-76. DOI:https://doi.org/10.22146/bkm.v38i03.1787.