Praekunatham, H., Buranasatitnon, S., & Ruksakom, H. (2022). Situation and Spatial Analysis of the COVID-19 Epidemic in Business Establishments: Comparison between the Delta and Omicron Variants in Thailand, July 2021–May 2022. Outbreak, Surveillance, Investigation & Response (OSIR) Journal, 15(4), 114–122. https://doi.org/10.59096/osir.v15i4.262274