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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 [Box]). The 12 cases occurred in five states (Indiana, Iowa, Maine, Pennsylvania, and West Virginia), and 11 were in children (1,2). Six of the 12 patients had no identified recent exposure to swine. Three of the 12 patients were hospitalized, and all have recovered fully.
A case in an adult male in Indiana with occupational exposure to swine was among the 12, and two children in West Virginia who regularly attended the same day care accounted for the latest cases. This report describes those cases and swine influenza virus (SIV) surveillance being conducted by the U.S. Department of Agriculture (USDA).
Case Reports
Indiana. On October 28, 2011, CDC was notified by the Indiana Department of Health of a suspected case of A(H3N2)v virus infection in an adult male. The patient experienced onset of fever, cough, shortness of breath, nausea, vomiting, and body aches on October 20, and was hospitalized for 4 days. He did not receive treatment with influenza antiviral medications and recovered fully.
On October 22, a respiratory specimen from the patient was positive for influenza at the hospital. On October 28, the virus was identified by real-time, reverse transcription?polymerase chain reaction (rRT-PCR) testing at the Indiana State Public Health Laboratory as an inconclusive influenza A virus, consistent with results seen with other recent A(H3N2)v infections. On October 31, genome sequencing at CDC confirmed the virus as A(H3N2)v with the M gene from the A(H1N1)pdm09 virus, similar to the viruses identified in the other cases of human infection in the United States since August 2011.
The patient reported direct contact with swine during his work in the week before illness onset. He said he did not wear any personal protective equipment (PPE) because the swine did not exhibit signs of illness. No illness was reported among the patient's household members or other close contacts.
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A case in an adult male in Indiana with occupational exposure to swine was among the 12, and two children in West Virginia who regularly attended the same day care accounted for the latest cases. This report describes those cases and swine influenza virus (SIV) surveillance being conducted by the U.S. Department of Agriculture (USDA).
Case Reports
Indiana. On October 28, 2011, CDC was notified by the Indiana Department of Health of a suspected case of A(H3N2)v virus infection in an adult male. The patient experienced onset of fever, cough, shortness of breath, nausea, vomiting, and body aches on October 20, and was hospitalized for 4 days. He did not receive treatment with influenza antiviral medications and recovered fully.
On October 22, a respiratory specimen from the patient was positive for influenza at the hospital. On October 28, the virus was identified by real-time, reverse transcription?polymerase chain reaction (rRT-PCR) testing at the Indiana State Public Health Laboratory as an inconclusive influenza A virus, consistent with results seen with other recent A(H3N2)v infections. On October 31, genome sequencing at CDC confirmed the virus as A(H3N2)v with the M gene from the A(H1N1)pdm09 virus, similar to the viruses identified in the other cases of human infection in the United States since August 2011.
The patient reported direct contact with swine during his work in the week before illness onset. He said he did not wear any personal protective equipment (PPE) because the swine did not exhibit signs of illness. No illness was reported among the patient's household members or other close contacts.
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