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【摘 要】
：
Background Pandemic influenza A (H1N1) emerged rapidly in China in May 2009. Preliminary comparisons with seasonal influenza suggest that pandemic 2009 influenz
【机 构】
：
Department of Infectious Disease,Department of Internal Medicine,Department of Respiratory Disease,D
【出 处】
：
中华医学杂志（英文版）
【发表日期】
：
2004年期
【基金项目】
：
the Biomedical Key Research Grant from the Commission of Science and Technology,Shanghai
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