SCHWEINEGRIPPE, GRIPPE, EPIDEMIE, KRANKHEIT,

A passenger wearing a protective mask exits a plane upon arrival from San Salvador and Guatemala to Mexico at the Benito Juarez International Airport in Mexico City, Monday, April 27, 2009. A fatal strain of swine flu has been detected in Mexico and believed to have killed 149 people, while the virus has been confirmed or suspected in at least a half-dozen other countries. (AP Photo/Rodrigo Abd)