“Nosocomial Outbreak of Coronavirus Disease in Two General Wards During the Initial Wave of the Pandemic in 2020, Tokyo, Japan”. Western Pacific Surveillance and Response 13, no. 1 (March 24, 2022): 5. Accessed April 4, 2026. https://ojs-dev.wpro.who.int/ojs/index.php/wpsar/article/view/906.