niman wrote:
The details on the trH3N2 are not revealed in the current week 4 MMWR. The week 3 MMWR made no mention of a 2011 case
http://www.cdc.gov/mmwr/preview/mmwrhtm ... mm6003md_wHowever, the week 4 report does not indicate the trH3N2 is "current" and does not give the state. However, the footnote does acknowledge a 2011 case and does indicate it is a trH3N2. There were 4 trH3N2 cases in 2009 (two in MN, one in WI and one in PA) and two in 2009 (in KS and IA).
PA has reported many unsubtypable cases, but it remains unclear as to why the cases were classified as unsubtypable, which is normally reserved for novel cases (as opposed to not typed, which simply means that sub-typing wasn't done).
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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