MMWR Morb Mortal Wkly Rep. 2009 May 1;58(16):431-3.
Since April 21, 2009, CDC has reported cases of respiratory infection with a swine-origin influenza A (H1N1) virus (S-OIV) transmitted through human-to-human contact. This report updates cases identified in U.S. states and highlights certain control measures taken by CDC. As of April 28, the total number of confirmed cases of S-OIV infection in the United States had increased to 64, with cases in California (10 cases), Kansas (two), New York (45), Ohio (one), and Texas (six). CDC and state and local health departments are investigating all reported U.S. cases to ascertain the clinical features and epidemiologic characteristics. On April 27, CDC distributed an updated case definition for infection with S-OIV.
自2009年4月21日以来，美国疾病控制与预防中心（CDC）报告了经人际传播的甲型H1N1猪源流感病毒（S-OIV）引起的呼吸道感染病例。本报告更新了美国各州确认的病例，并重点介绍了CDC采取的某些防控措施。截至4月28日，美国S-OIV感染确诊病例总数增至64例，其中加利福尼亚州（10例）、堪萨斯州（2例）、纽约州（45例）、俄亥俄州（1例）和得克萨斯州（6例）。CDC以及州和地方卫生部门正在对美国所有报告病例展开调查，以确定临床特征和流行病学特征。4月27日，CDC发布了S-OIV感染的最新病例定义。
