Officials at the Centers for Disease Control and Prevention (CDC) acknowledged on Friday that “concern has grown” since the first reports of a novel swine flu infecting patients in Texas and California emerged late March.
Dr. Richard Besser, acting director of the agency, said health officials are closely tracking the spread of the swine flu, after additional cases of flu and some deaths were reported in Mexico. Preliminary testing of flu viruses in patients in Mexico and the U.S. show that the strains are similar. Of the 14 samples of suspected swine flu from Mexico that the CDC has tested so far, half are positive for swine flu, a form of influenza that normally infects pigs and can be transmitted to people. (See pictures of the world’s most polluted places.)
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