U.S. health officials monitor deadly virus

Officials in the US tonight are monitoring a deadly virus that is spreading overseas. Airports in Southeast Asia are now heightening their airport screenings. Raph Sanchez is following this from London for us.And Raph, what more do we know. So Tom, airports across the region are stepping up their screening for what's known as the Nepa virus. This is a far more deadly virus than CO.It has a fatality rate of between 40 and 75% according to the World Health Organization. Now, it's usually carried by fruit bats ...