Nipah virus is a lethal, bat-borne pathogen with a high mortality rate and pandemic potential.

Health · Published 3 October 2026 Swipe more like this →

In short: First identified in Malaysia in 1998, Nipah virus is a zoonotic pathogen that causes severe neurological and respiratory disease. With no licensed treatment or vaccine, it remains a global priority for urgent research, as it can spread from animals to humans and directly between people with deadly efficiency.

Nipah virus (NiV) is an RNA virus within the Henipavirus genus, naturally hosted by fruit bats of the Pteropodidae family. While these bats show no signs of illness, the virus is highly pathogenic to a wide range of mammals. It first emerged in 1998 in Malaysia, where an outbreak among pig farmers led to 283 symptomatic cases and 109 deaths. The virus was named after the Sungai Nipah village where it was isolated from a patient's cerebrospinal fluid in 1999.

Transmission occurs through direct contact with infected animals, such as pigs, or by consuming food contaminated by bat secretions, notably raw date palm sap. Once a human is infected, the virus can spread between people through close contact with body fluids, posing a significant risk in healthcare settings. The incubation period typically ranges from 3 to 14 days, though cases as long as 45 days have been documented. Symptoms often begin with fever and headache, rapidly progressing to encephalitis, seizures, and coma within 24 to 48 hours.

The case fatality rate is estimated to be between 40% and 75%. Because there are no specific antiviral treatments or vaccines, management relies entirely on intensive supportive care, including hydration, oxygen, and monitoring for complications like brain swelling. Due to its high lethality and potential for person-to-person transmission, the WHO classifies Nipah as a priority disease. Research is complicated by the virus's status as a Biological Safety Level 4 pathogen, requiring specialized, high-containment laboratory facilities for handling samples.

Outbreaks have been reported in Malaysia, Singapore, Bangladesh, India, and the Philippines. In Bangladesh, seasonal outbreaks occur almost annually, often linked to the consumption of date palm sap. Experts emphasize a One Health approach, which integrates human, animal, and environmental surveillance to prevent spillover events. As the natural reservoir of Pteropus bats is distributed across Asia, the South Pacific, and Australia, the potential for future outbreaks in new geographical areas remains a significant public health concern.

General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.

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