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)
Content available for editorial use, pre-approval required for all other uses.
Content may not be substantially altered without pre-approval from provider.
May not credit Reuters for commercial, political, or advertising usage.
Not available for distribution, sale, or license by Corbis' international representatives.
Reuters content is available for licensing to and for use by third parties in the United States, United Kingdom, Canada, Germany, and Belgium only.
Uncompressed file sizes and pixel dimensions are approximate. Grayscale images are 1/3 the file size of RGB files. Files downloaded directly from the website are compressed JPEG format. You may request a TIFF file, if available, or a larger interpolated size for your output needs. Please contact Customer Service for associated production fees.