A rare and deadly virus has re-emerged in India, putting health authorities across Asia on edge.

India has confirmed two cases of the Nipah virus, a zoonotic disease carried by fruit bats and known for its high fatality rate. The cases were detected in West Bengal, with both patients identified as healthcare workers.

Nipah virus can spread through contact with infected animals, contaminated food such as raw date palm sap, and close human contact—particularly in hospital settings.

Symptoms include fever, headache, breathing difficulties and confusion, with severe cases leading to brain inflammation, coma and death. There is no approved vaccine or cure, making early detection and supportive care critical.

Countries including Thailand, Vietnam and Indonesia have tightened airport screening for travellers from India. China has also strengthened border surveillance.

The World Health Organisation says the risk of international spread remains low and has not advised travel restrictions.