Official: U.S. flu victims may be infecting others

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Ana Navarro, 40, wears a mask as she waits in line with others to clear U.S. Customs crossing from Ciudad Juarez, Mexico, into El Paso, Texas, Monday, April 27, 2009. U.S. Customs officials are paying attention to anyone who may be sick and asking travelers about illnesses if they are entering from regions with confirmed swine flu outbreaks.

The swine flu epidemic crossed new borders today with the first cases confirmed in the Middle East and the Asia-Pacific region, as world health officials said they suspect American patients may have transmitted the virus to others in the U.S.

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