A traveler walks past a display board showing a canceled flight from Wuhan at Beijing Capital International Airport Thursday. China closed off the city of more than 11 million in an unprecedented effort to try to contain a deadly new viral illness that has sickened hundreds and spread to other cities and countries during the Lunar New Year travel rush.

A traveler walks past a display board showing a canceled flight from Wuhan at Beijing Capital International Airport Thursday. China closed off the city of more than 11 million in an unprecedented effort to try to contain a deadly new viral illness that has sickened hundreds and spread to other cities and countries during the Lunar New Year travel rush.