US CDC, One human case of trH3N2 influenza virus infection in 2011 (Feb 3 2011)

[Giuseppe]

Source: US Centers for Disease Control and Prevention, Morbidity and Mortality Weekly Report, February 3rd 2011, full text: http://www.cdc.gov/mmwr/preview/mmwrhtml/mm6004md.htm?s_cid=mm6004md_x

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*** CDC discontinued reporting of individual confirmed and probable cases of 2009 pandemic influenza A (H1N1) virus infections on July 24, 2009.

During 2009, four cases of human infection with novel influenza A viruses, different from the 2009 pandemic influenza A (H1N1) strain, were reported to CDC.

The four cases of novel influenza A virus infection reported to CDC during 2010 and the one case reported in 2011 were identified as swine influenza A (H3N2) virus and are unrelated to the 2009 pandemic influenza A (H1N1) virus.

Total case counts for 2009 were provided by the Influenza Division, National Center for Immunization and Respiratory Diseases (NCIRD).

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[Giuseppe]

Re: US CDC, One human case of trH3N2 influenza virus infection in 2011 (Feb 3 2011)

Source: US Centers for Disease Control and Prevention, http://www.cdc.gov/flu/weekly/

February 4 2011

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Novel Influenza A Virus:

One case of human infection with a novel influenza A virus was reported by the Pennsylvania Department of Health.

The patient was infected with a swine origin influenza A (H3N2) virus.

The patient reported contact with pigs in the week preceding symptom onset on September 6, 2010, did not require hospitalization, and has since fully recovered.

Initial testing of the specimen indicated a seasonal influenza A (H3N2) virus and the specimen was submitted to CDC as a routine surveillance sample.

The delay from onset to detection occurred because attempts to culture the virus were unsuccessful.

RT-PCR testing confirmed swine-origin influenza A (H3N2).

Six other human infections with swine origin influenza A (H3N2) viruses have been identified in the United States during 2009 through 2010, including one other case from Pennsylvania in week 44 of 2010.

No epidemiologic links between this case and any of the other cases of swine-origin H3N2 infection have been identified and the viruses from all seven cases have genetic differences indicating different sources of infection.

There is no evidence of human-to-human transmission with this virus; however, early identification and investigation of all human infections with novel influenza A viruses is critical to evaluate the extent of the outbreak and possible human-to-human transmission.

Surveillance for human infections with novel influenza A viruses continues year round.

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