Nipah Virus Update: West Bengal, India

29 January 2026: India confirmed two cases of Nipah virus infection this month in the eastern state of West Bengal.

Both individuals are 25-year-old nurses—a woman and a man—working at the same private hospital in Barasat, located in North 24 Parganas district. They developed initial symptoms in the last week of December 2025, which progressed rapidly to neurological complications. The two were placed in isolation in early January.

The cases were initially identified as suspected Nipah virus infections on 11 January by the Viral Research and Diagnostic Laboratory at a government hospital in Kalyani. Confirmation was subsequently provided by the National Institute for Virology in Pune on 13 January.

As of 21 January, the male patient is recovering, while the female patient remains in critical condition.

Containment and Public Health Response

Following confirmation, an extensive public health response was activated. A total of 196 individuals who had contact with the confirmed cases were identified, traced, monitored, and tested. All contacts have remained asymptomatic and have tested negative for Nipah virus infection.

As of 27 January 2026, no additional cases have been detected.

Risk Assessment

India has demonstrated its capacity to manage Nipah outbreaks during previous events and recommended public health measures are being implemented jointly by national and state health teams. At this time, there is no evidence of increased human-to-human transmission.

WHO assesses the risk at the sub-national level in West Bengal as moderate, given the presence of fruit bat reservoirs in the India–Bangladesh border areas and the possibility of sporadic zoonotic spillover. However, the national, regional, and global risk remains low.

The cases are confined to North 24 Parganas district, with no reported travel while symptomatic. All identified contacts have tested negative, and surveillance and infection prevention measures have been intensified. The likelihood of spread to other Indian states or internationally is considered low.

Historically, Nipah outbreaks in the WHO South-East Asia Region have been limited to Bangladesh and India, occurring sporadically or in small clusters. Human-to-human transmission is rare and usually confined to health-care settings or close family contacts. There have been no known instances of international spread through travel.

Based on current evidence, WHO does not recommend any travel or trade restrictions.

WHO Recommendations and Community Guidance

Currently, there is no licensed vaccine or specific treatment for Nipah virus infection, although several candidates are under development. Early supportive care, including intensive care for severe respiratory or neurological complications, remains critical for improving survival.

WHO emphasizes the importance of infection prevention and control in health-care settings and community awareness to reduce exposure risks. Key public health messages include:

• Reducing bat-to-human transmission by preventing bats from accessing date palm sap, boiling freshly collected sap, washing and peeling fruits thoroughly, discarding fruits with signs of bat bites, and avoiding areas where bats roost.
• Reducing animal-to-human transmission by wearing protective clothing and gloves when handling sick animals or during slaughtering and culling.
• Reducing human-to-human transmission by avoiding unprotected close contact with infected individuals and practicing regular hand hygiene.
• Strengthening infection control in health-care settings, including adequate ventilation, risk assessment, and the use of appropriate personal protective equipment when caring for suspected or confirmed cases.

WHO continues to work closely with national and state health authorities in India to support risk assessment, surveillance, and outbreak response efforts.

                                                                                   For more details and factsheets, please click here

Nipah virus is a zoonotic disease transmitted mainly from bats to humans, sometimes through contaminated food or close contact. With no licensed vaccine or treatment currently available, early detection, supportive care, and strong infection prevention measures remain essential. 

This story was first published here

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