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Update: infections with a swine-origin influenza A (H1N1) virus--United States and other countries, April 28, 2009.
MMWR Morb Mortal Wkly Rep. 2009 May 1;58(16):431-3
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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.
PMID: 19407737 [PubMed - indexed for MEDLINE]