Highly contagious virus, which spreads from animals to humans, has a high fatality rate and there is no vaccine

Airports across Asia have been put on high alert after India confirmed two cases of the deadly Nipah virus in the state of West Bengal over the past month.

Thailand, Nepal and Vietnam are among the countries screening airport arrivals over fears of an wider outbreak of the virus, which can spread from animals to humans and has a high fatality rate.