In late January 2026, health authorities in India confirmed a fresh outbreak of Nipah virus disease in the state of West Bengal. This triggered heightened attention across South and Southeast Asia, not just because of the virus’s notoriously high fatality rate, but also because of how it spreads and what it means for public health in neighbouring countries. Here’s a clear look at what’s happening, why it matters, and what people should know.
What the World Health Organization Reports
The World Health Organization (WHO) reported that on 26 January, India notified them of two laboratory-confirmed cases of Nipah virus infection in West Bengal, detected in healthcare workers at a hospital in Barasat. Both patients showed severe symptoms of the infection, with one still under mechanical ventilation and the other improving by mid-January. Indian health authorities followed up by identifying and testing more than 190 contacts linked to these cases. All those contacts tested negative for the virus and remained asymptomatic, which suggests that, so far, there has been no further spread beyond those initial confirmed infections.
WHO described Nipah as a serious but rare zoonotic disease. It is transmitted from infected animals like fruit bats and pigs to humans through direct contact with bodily fluids or contaminated food such as raw date palm sap. It can also spread from person to person through close contact. Despite the severity of individual cases, WHO currently assesses the public health risk at moderate within affected parts of India and low at national, regional, and global levels. This is because outbreaks have been limited and effectively managed early, with no spread detected beyond close contacts.
Importantly, WHO does not recommend travel or trade restrictions at this stage, noting there is no evidence of increased human-to-human transmission or widespread spread beyond the outbreak area.
How Nipah Virus Affects People
Nipah virus infection can produce a range of symptoms, from mild flu-like illness to severe neurological disease. Early signs include fever, headache, muscle pain, vomiting, and sore throat. More serious cases may progress to acute respiratory distress or encephalitis, a dangerous inflammation of the brain that can lead to confusion, seizures, coma, or death. The incubation period typically ranges from 3 to 14 days, but in rare cases may be longer. The fatality rate for Nipah infection in previous outbreaks has ranged between 40 and 75 percent, reflecting how dangerous the disease can be when severe. There is no licensed vaccine or specific antiviral treatment. Supportive care in a hospital setting remains the mainstay of treatment, alongside strict infection prevention measures.
Regional Responses: Airport Screenings and Precautions
The confirmation of Nipah cases in India spurred several Asian countries to implement precautionary health screening measures at airports and border points. Thailand, Nepal, Taiwan, Singapore, Hong Kong, Malaysia, and Pakistan have introduced or reinforced temperature checks, health declarations, and screening protocols for travellers arriving from West Bengal and neighbouring areas. These measures are reminiscent of the COVID-19 era, designed to catch anyone who might show symptoms and to reassure the public.
In Thailand, for example, health officials reported screening over 1,700 passengers arriving from Kolkata with no cases detected. The screening includes thermal scans and health questionnaires. Despite these steps, health experts stress that airport screenings are largely precautionary and not scientifically guaranteed to stop rare diseases like Nipah from spreading internationally. Temperature checks may miss asymptomatic or incubating cases, and WHO has not recommended these measures as a necessary public health step. India’s own health ministry has stated that there is no need for routine passenger screening at airports within the country because the outbreak has been contained and no community transmission detected.
Why Neighbouring Countries Are Alert
Even with a limited outbreak, neighbouring countries are vigilant. Nipah virus has previously caused outbreaks in South Asia, particularly in Bangladesh where regular seasonal cases coincide with the harvesting of date palm sap, a known risk factor when bats contaminate raw sap with their saliva or urine. Countries with frequent travel links to India, like Pakistan and Thailand, have issued advisories and strengthened health checks at airports and land borders to detect infected travellers early and prevent potential spread. Thermal checks, travel history screenings, and symptom monitoring are part of these measures.
Prevention and What People Should Know
Prevention remains critical given the lack of vaccines or specific treatments. Public health guidance includes avoiding close contact with bats and other potentially infected animals, not consuming raw date palm sap, and practising good hygiene around sick people or animals. Early medical care upon symptom onset is crucial and can save lives. Health workers and caregivers are especially at risk in outbreaks and are urged to use protective equipment and follow strict infection control protocols to reduce the chance of transmission in healthcare settings.
What Comes Next?
The 2026 outbreak in West Bengal is a reminder that Nipah virus remains an ongoing zoonotic threat in South Asia. While current evidence suggests a low risk of widespread transmission, even small outbreaks can have serious consequences because the virus can be fatal and spreads through direct contact. Continued surveillance, rapid response, public awareness, and international cooperation are key to controlling the virus and preventing future outbreaks. In the meantime, travellers and residents in affected regions should stay informed, follow official health advice, and take practical steps to reduce exposure and recognise symptoms early. Vigilance, not panic, will help keep communities safe.
