Nipah Virus
Virology, Transmission, and Pandemic Potential
Nipah virus (NiV), a paramyxovirus in the genus Henipavirus, was first identified during a 1998–99 outbreak in Malaysia (Sungai Nipah village), where 265 cases and 105 deaths were recorded, primarily among pig farmers. The natural reservoir is the fruit bat (Pteropus genus, commonly called flying foxes), which carries the virus asymptomatically. Transmission to humans occurs through direct contact with infected bats (via fruit contaminated with bat saliva or urine), consumption of date palm sap contaminated by bat excretions, or contact with infected animals (pigs in the original Malaysian outbreak). Human-to-human transmission has been documented, particularly in healthcare settings without adequate PPE.
- Case fatality rate (CFR) varies by outbreak: 40–75% across documented outbreaks globally; Kerala's 2018 outbreak had a CFR of ~91%, making it among the deadliest.
- There is no approved vaccine or specific antiviral treatment for Nipah; clinical management is supportive (ventilation, seizure management).
- Nipah virus is on the WHO R&D Blueprint list of priority pathogens — diseases with pandemic potential for which no adequate countermeasures exist, requiring accelerated research.
- Kerala's Nipah outbreaks are geographically concentrated in the northern districts (Kozhikode, Malappuram) where Pteropus medius bat populations overlap with human habitation.
● Tracked since February 01, 2026 · last seen June 18, 2026 · updates as the daily brief publishes