An outbreak of the deadly Nipah virus in West Bengal, India, has triggered tighter health checks at airports in Asia. Thailand has started screening passengers at three airports receiving flights from West Bengal. Nepal has begun screening arrivals at Kathmandu airport and border points with India. Early this month, five healthcare workers in West Bengal caught the virus. One is in a critical condition. About 110 people who were near them are now quarantined. The Nipah virus can spread from animals like bats and pigs to humans. People can also catch it through food or direct contact. It has a high death rate between 40% and 75%, and no vaccine or cure is available yet. Symptoms start with fever, headache, muscle pain, vomiting, and sore throat. In severe cases, people may get brain inflammation called encephalitis, which can be fatal. The virus first appeared in Malaysia in 1998, killing over 100 people and causing major losses to farmers. Since then, Bangladesh and parts of India, including Kerala and West Bengal, have seen outbreaks. Recently, West Bengal reported at least five confirmed Nipah cases linked to a private hospital in Barasat. Two nurses are in intensive care, with one very critical. Although no cases have been found outside India so far, Thailand and Nepal have heightened airport screenings. Thailand also increased checks in tourist spots. Taiwan is planning to list Nipah as a high-risk disease needing urgent control. These moves aim to stop the virus from spreading beyond India.