Seven-month-old Alexa Zuniga wears a surgical mask at the airport in Tijuana, Mexico, Tuesday, April 28, 2009. At least five people have been hospitalized with swine flu in the United States and deaths are likely, a U.S. health official said Tuesday. In Mexico, more than 150 deaths were believed to have been caused by swine flu. (AP Photo/Guillermo Arias)
