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Nipah virus resurfaces in West Bengal, raising alarm
An outbreak of the lethal Nipah virus in India's West Bengal state has triggered heightened surveillance across parts of Asia, with neighboring countries introducing airport and border checks to prevent cross-border spread.
Current outbreak and response
Five healthcare workers in West Bengal tested positive for the virus earlier this month, according to local health officials. One remains in critical condition. Authorities have quarantined 110 individuals who had contact with the infected workers.
All confirmed cases are linked to a private hospital in Barasat. Two nurses are receiving treatment in an intensive coronary care unit, with one described as "very critical" by the state health department, local media reported.
Transmission and risks
The Nipah virus spreads from animals-primarily fruit bats and pigs-to humans. It can also transmit person-to-person through contaminated food or direct contact. With no approved vaccine or treatment, the virus carries a mortality rate between 40% and 75%.
The World Health Organization lists Nipah among its top ten priority diseases due to its epidemic potential, alongside pathogens like COVID-19 and Zika.
Symptoms range from fever, headaches, and muscle pain to severe complications such as encephalitis-brain inflammation-which can be fatal. The incubation period spans four to 14 days, and some infected individuals show no symptoms at all.
Regional precautions
Thailand has initiated health screenings at three international airports in Bangkok and Phuket for passengers arriving from West Bengal. Travelers are required to submit health declarations, and authorities have intensified monitoring at natural tourist sites.
"We are fairly confident in our ability to prevent an outbreak in Thailand,"
Jurai Wongswasdi, Spokeswoman, Department for Disease Control
Nepal has also begun screening arrivals at Kathmandu's airport and land border crossings with India. Meanwhile, Taiwan's health authorities have proposed classifying Nipah as a "Category 5 disease," mandating immediate reporting and strict control measures.
Historical context and past outbreaks
The Nipah virus was first identified in 1998 during an outbreak among pig farmers in Malaysia, later spreading to Singapore. The virus takes its name from the Malaysian village where it was discovered. Over 100 people died, and a million pigs were culled to contain the spread, causing significant economic losses.
Bangladesh has experienced the highest burden in recent years, with over 100 fatalities since 2001. India has reported outbreaks in West Bengal (2001 and 2007) and Kerala, where 17 of 19 cases proved fatal in 2018. In 2023, two of six confirmed cases in Kerala resulted in death.
Global preparedness concerns
While no cases have been reported outside India in the current outbreak, health experts emphasize the need for vigilance. The lack of approved treatments and the virus's high fatality rate underscore the urgency of containment efforts.
