Passengers wearing protective masks arrive at Comalapa International Airport in El Salvador
Passengers wearing protective masks arrive at Comalapa International Airport in El Salvador April 30, 2009. The El Salvador government has announced a preventive alert against influenza A (H1N1), formerly referred to as swine flu. Public health authorities reported three suspected cases of the virus in the country. REUTERS/Luis Galdamez (EL SALVADOR AGRICULTURE TRANSPORT HEALTH SOCIETY)
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