Update: Influenza A (H3N2)v transmission and guidelines - five states, 2011.
From August 17 to December 23, 2011, CDC received reports of 12 human infections with influenza A (H3N2)v viruses that have the matrix (M) gene from the influenza A (H1N1)pdm09 virus (formerly called swine-origin influenza A [H3N2] and pandemic influenza A [H1N1] 2009 viruses, respectively). The 12 cases occurred in five states (Indiana, Iowa, Maine, Pennsylvania, and West Virginia), and 11 were in children. Six of the 12 patients had no identified recent exposure to swine. Three of the 12 patients were hospitalized, and all have recovered fully.
D000328:Adult; D000818:Animals; D002656:Child Day Care Centers; D002675:Child, Preschool; D017408:Guidelines as Topic; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype / Q000235:genetics*; D053122:Influenza A Virus, H3N2 Subtype / Q000235:genetics / Q000302:isolation & purification*; D007251:Influenza, Human / Q000175:diagnosis* / Q000635:transmission*; D008297:Male; D016273:Occupational Exposure; D011159:Population Surveillance; D013552:Swine; D014481:United States