Why is India’s Nipah virus outbreak spooking the world?

Concerns are rising across Asia following a recent outbreak of the Nipah virus in India’s West Bengal state. The situation has prompted several countries, including Thailand, Indonesia, Nepal, and Malaysia, to increase health screenings at their airports as millions prepare to travel for the Lunar New Year holiday.

Understanding the Current Situation

Since December 2025, two confirmed cases of the Nipah virus have been identified in West Bengal, according to India’s health ministry. Importantly, health officials report that all 196 individuals who had contact with the confirmed cases have tested negative for the virus and remain asymptomatic. The ministry stated that the situation is being closely monitored and all necessary public health measures are in place.

Did You Know? The first known outbreak of Nipah virus occurred in 1998, impacting pig farmers and butchers in Malaysia and Singapore.

Reports indicate that both individuals confirmed to have the virus in late December are healthcare workers being treated at a local hospital. This suggests a potential transmission from an as-yet-undiagnosed patient within the healthcare facility.

What is the Nipah Virus?

The Nipah virus (NiV) is a zoonotic disease, meaning it spreads between animals and humans. Transmission can occur from animals like fruit bats and flying foxes, through contaminated food, or directly from person to person. The virus is potentially deadly, with an incubation period of five to 14 days and symptoms appearing within three to four days.

According to Kaja Abbas, associate professor of infectious disease epidemiology and dynamics at the London School of Hygiene & Tropical Medicine and Nagasaki University, the virus causes severe respiratory and neurological disease, potentially leading to acute encephalitis, convulsions, mental confusion, and even coma within 24 to 48 hours in severe cases.

Expert Insight: While the case fatality rate for Nipah virus is high, ranging from 40 to 75 percent, the virus’s basic reproduction number is typically below one, suggesting limited human-to-human spread and a lower risk of a widespread pandemic.

Despite the high fatality rate, the virus doesn’t appear to spread easily from person to person.

Past Outbreaks and Global Response

Outbreaks of Nipah virus have occurred previously in Malaysia, Singapore (1998), the Philippines (2014), and repeatedly in South Asia, particularly Bangladesh and India since 2001. In Bangladesh, outbreaks have been linked to consuming contaminated palm sap and close contact with infected individuals. India first recorded cases in West Bengal in 2007, with an earlier outbreak retrospectively identified in Siliguri city in 2001, where 75 percent of cases were among healthcare workers or visitors.

Kerala, India, is now considered the region with the highest risk for the virus, having reported dozens of deaths since 2018. The cause of the recent outbreak in West Bengal remains unclear, occurring after decades without reported cases in the region.

Treatment and Prevention

Currently, there is no approved vaccine or treatment for Nipah virus infection. However, clinical trials for a vaccine are underway at the University of Oxford in Bangladesh, with the second phase of trials launching in December 2025. In the meantime, doctors have used antiviral medications like Ribavirin, though its effectiveness remains uncertain. Remdesivir has also shown potential in preventing Nipah in nonhuman primates and was used in a 2023 outbreak in Kerala, reportedly improving the case fatality rate.

Preventative measures, as outlined by the World Health Organization, include decreasing bat access to food sources like date palm sap, thoroughly washing and peeling fruits, and practicing good hygiene, proper ventilation, and avoiding close contact with infected individuals. Healthcare settings require contact and droplet precautions, and potentially airborne precautions.

Regional Concerns and Future Outlook

The outbreak has raised concerns in China, with social media reflecting anxieties about a potential resurgence of lockdowns. China’s state broadcaster, CCTV, has acknowledged the risk of imported cases, despite no current reports of the virus within the country. However, experts, including Abbas, emphasize that Nipah virus is not comparable to COVID-19 in terms of its potential for widespread, prolonged disruption, and severe cases can be managed with intensive supportive care.

Frequently Asked Questions

What are the symptoms of Nipah virus?

Symptoms include fever, headache, progressing to acute encephalitis (brain inflammation) in severe cases. Other symptoms can include convulsions and mental confusion, and patients can fall into a coma within 24 to 48 hours.

How is the Nipah virus transmitted?

The virus is transmitted from animals such as fruit bats and flying foxes to humans. It can also be transmitted to humans via contaminated food products or directly from person to person.

Is there a vaccine available for Nipah virus?

Currently, there is no approved vaccine available for people or animals infected by the virus, but clinical trials are underway.

Given the recent outbreak and heightened surveillance, what role will international collaboration play in managing the potential spread of Nipah virus?

Why is India’s Nipah virus outbreak spooking the world? | Health News