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据美国媒体报道,世界卫生组织4月28日表示,美国猪流感病毒的传播已经不仅仅局限于从墨西哥归来的旅行人员身上,猪流感患者可能已经将此种病毒传染给了其他美国人。
According to the U.S. media, the World Health Organization said on April 28 that the spread of the swine flu in the United States has spread beyond the mere arrival of travelers returning from Mexico. Swine flu patients may have transmitted the virus to other Americans.