respiratory virus that health officials are calling a threat to the entire world. at least 50 people have been infected in eight countries, most in the middle east. the world health organization says 30 of those patients have died, and that number will likely get higher because experts simply don't understand how the virus is spreading. cnn's mary snow has more. >> reporter: hollywood movies like contagion are sobering reminders of the real threat of deadly viruses. >> the average person touches their face three to five times an hour. in between touching door knobs, water fountains, and each other. >> is he we have a virus, no treatment protocol and no vaccine. >> reports of a strain of corona virus overseas is nowhere near the movie version of an outbreak. so far, there are no reported cases in the united states. its name, the middle east respiratory syndrome coronavirus. world health organization calls