共查询到20条相似文献，搜索用时 15 毫秒
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Normile D 《Science (New York, N.Y.)》2004,304(5671):659-661
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Enserink M 《Science (New York, N.Y.)》2003,300(5625):1487-1488
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Normile D 《Science (New York, N.Y.)》2003,300(5620):714-715
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Normile D 《Science (New York, N.Y.)》2003,300(5621):886-887
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Normile D 《Science (New York, N.Y.)》2003,301(5638):1303-1304
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Greensfelder L 《Science (New York, N.Y.)》2000,290(5498):1867b-1869b
A small cluster of polio cases in the Dominican Republic and Haiti marks both the first polio outbreak in the Western Hemisphere in more than 9 years and the first reliable report that a vaccine-derived polio strain may have reverted to a virulent form and spread contagiously. Although a massive vaccination campaign already in the works is expected to contain the outbreak, the unusual incident raises troubling questions about a vaccine that has been in widespread use for nearly 40 years. 相似文献
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Enserink M 《Science (New York, N.Y.)》2003,300(5618):413-414