Nipah Virus Outbreak: India and Bangladesh Combat Deadly Zoonotic Disease

The Nipah virus (NiV) has once again emerged as a significant public health concern with recent cases reported in both India and Bangladesh [14, 26]. These outbreaks underscore the persistent threat posed by this zoonotic pathogen, which is known for its high fatality rate and the absence of a specific vaccine or treatment [3, 5, 10]. In India, reports indicate that cases have been spreading since late January 2026, originating in the eastern state of West Bengal [14, 27]. The Indian Ministry of Health and Family Welfare confirmed two cases in West Bengal since December 2025 [17, 25]. While the authorities have assured "timely containment" of the virus, the situation has led to heightened surveillance, including enhanced screening measures at airports across Asia [17, 25, 26]. Notably, this outbreak is significant as it marks the first cases detected in West Bengal since 2007 [17]. Previous outbreaks in India, particularly in Kerala, have also caused fatalities, with reports of 17 deaths in 2018 and two in 2023 [17, 25]. Meanwhile, in Bangladesh, a woman in northern Bangladesh died in January 2026 after contracting the Nipah virus [14, 26]. The patient, aged between 40 and 50 years, developed symptoms including fever and headache, followed by hypersalivation, disorientation, and convulsions. She died a week after symptom onset, with the infection confirmed posthumously [14, 26]. This case follows two recent Nipah virus cases identified in neighboring India, which prompted enhanced airport screening measures across parts of Asia [26]. The Bangladesh case had no travel history but had a history of consuming raw date palm sap, a known risk factor for Nipah transmission [26]. All 35 individuals who came into contact with her are currently being monitored and have tested negative for the virus, with no further cases detected to date [26]. Bangladesh has a history of Nipah outbreaks, with cases reported almost every year, particularly during the winter months from December to April, coinciding with the harvesting and consumption of date palm sap [16, 22]. In 2023, Bangladesh reported 14 cases, the highest number since 2015 [16, 20]. The Nipah virus is a bat-borne zoonotic RNA virus belonging to the Paramyxoviridae family [14]. Fruit bats of the Pteropodidae family, also known as 'flying foxes', are considered the natural host [14, 15]. Transmission to humans can occur through direct contact with infected animals (such as bats and pigs) or by consuming fruits or fruit products, like raw date palm juice, contaminated by infected fruit bats [5, 6, 14]. Human-to-human transmission is also possible through close contact with an infected person or their body fluids, though it is generally limited [5, 6, 14]. Symptoms of Nipah virus infection typically appear within 3 to 14 days after exposure and can range from mild flu-like symptoms to severe encephalitis (inflammation of the brain) and respiratory illness [3, 5, 8]. Severe cases can lead to coma and death. The case fatality rate is estimated to be between 40% and 75% [3, 5, 14]. Preventive measures are crucial given the lack of specific treatments and vaccines. These include regular handwashing, avoiding contact with bats and sick animals, avoiding consumption of raw date palm sap and fruits potentially contaminated by bats, and practicing good personal hygiene [6, 12, 13, 15]. Health authorities in both India and Bangladesh are actively engaged in surveillance, contact tracing, and public awareness campaigns to contain the spread of the virus [10, 14, 17, 19]. The World Health Organization (WHO) has identified Nipah virus as a high-priority pathogen requiring urgent research and development for effective countermeasures [6, 15]. The seasonal aspect of Nipah outbreaks is notable, with cases often peaking between December and May [14]. This period is characterized by bat breeding and nutritional stress, leading to increased virus shedding, and cooler weather that prolongs virus survival in the environment [14]. While the risk of international spread is considered low by the WHO, neighboring countries have implemented enhanced screening measures at airports as a precautionary step [26, 28]. The scientific community continues to research Nipah virus to better understand its transmission dynamics and develop effective diagnostic tools, treatments, and vaccines [9, 15, 23, 25].

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