http://www.portal.state.pa.us/portal/se ... 490&mode=2Pennsylvania Week 6 ....
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Nearly 80% of all specimens tested for influenza at the state lab were positive. Specimens tested at the state lab are mostly from people with influenza-like illness(ILI). This high positivity suggests that most people presenting with ILI at this time have the flu.
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Influenza type A continues to account for a majority (80%) of flu cases reported with flu type B causing the other 20%.
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Of the 45 influenza specimens sutyped at the state lab during week 6, a majority, (27/60%) were the 2009 A/H1N1, 13(29%) were the seasonal A/H3N2, 2 (4%) were untyped influenza type A and 3 (7%) were influenza type B. There has been an increase in 2009 A/H1N1 flu cases during the last two weeks.#
In addition to seasonal viruses, two unrelated infections with a swine origin influenza A/H3N2 virus have been identified in Pennsylvania with onset dates in September 2010 and October 2010. In recent years this virus has also produced human illness elsewhere in the country, generally in association with direct contact with ill pigs. It has not been associated with person-to-person transmission. Clinicians should remain alert to the possibility of infection with this virus in persons with influenza-like illness who have a history of recent exposure to swine populations, and collect appropriate diagnostic specimens.
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Five flu deaths were reported during week 6, including one deaths in a child. Altogether 32 flu deaths have been reported since October of 2010. Less than 20 flu deaths are reported by January during most flu seasons (except last year when the pandemic A/H1N1 circulated). These deaths may be an underestimate of all flu-related deaths because not all deaths are reported to the state and there may be a delay in reporting some deaths.#
Even though the elderly (people over 65 years) account for only 14% of all flu cases reported so far, they account for more than half of all hospitalizations and deaths.
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Influenza activity among health adults aged 25 to 49 years is on the increase, this is now the most affected age group followed by the elderly.
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Influenza activity is likely to continue increasing over the next few weeks.
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Most of the recent influenza hospitalizations and deaths were in people who had no recent history of influenza vaccination.