Countries across Asia are on high alert after cases of the deadly Nipah virus were detected in India. Though Indian officials said they have contained the outbreak, screenings at airports in Asia increased at major airports, with health declarations, temperature checks and visual monitoring of passengers.

Thailand and Nepal have introduced airport screenings for passengers arriving from West Bengal, India, as three cases of Nipah virus have been confirmed in the region since December

The World Health Organization reported two cases of a rare virus in an eastern Indian state on Thursday.

Thai authorities on Jan. 26 said that several species of fruit bats in the country carry highly virulent strains of Nipah virus, but the greater threat comes from infected individuals arriving from countries currently experiencing outbreaks.

The Nipah virus has a mortality rate of between 40% and 75%