An outbreak of the deadly Nipah virus in India's West Bengal state has sparked concern in parts of Asia, with some tightening screening measures at airports, BBC reported. 

Thailand has started screening passengers at three airports that receive flights from West Bengal. Nepal has also begun screening arrivals at Kathmandu airport and other land border points with India.

Two cases have been confirmed in West Bengal since December, reportedly in healthcare workers. Some 196 people who were in contact with them have been traced and tested negative for the virus, India's health ministry says, according to BBC.