Case Definitions Working Group. “Revised Surveillance Case Definitions: Poliovirus (non-Paralytic) Infection; Poliovirus (paralytic) Infection; Viral Haemorrhagic Fever”. Communicable Diseases Intelligence 37 (December 1, 2013): 415–417. Accessed April 16, 2026. https://ojs.cdi.cdc.gov.au/index.php/cdi/article/view/1251.