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Update: Influenza Activity -- United States

Influenza type A(H3N2) virus related to Bangkok/79 has accounted for greater than 90% of all influenza isolates reported during the 1982-1983 season. In recent weeks, increased numbers of type A(H1N1) virus isolates, related to the Brazil component of the current vaccine, have been identified; they have been reported in 11 states, while type A(H3N2) isolates have been reported in 37 states.

Four states (Nebraska, Ohio, Oklahoma, and Texas) reported widespread influenza activity for the week ending February 19. Another 15 states (Colorado, Idaho, Illinois, Iowa, Kansas, Kentucky, Maine, Michigan, Missouri, Montana, Nevada, Tennessee, South Dakota, Virginia, and Wisconsin) reported outbreaks in one or more locations. For the week ending February 19, the observed ratio of pneumonia and influenza (P&I) deaths to total deaths was 5.2, and the expected ratio was 4.1. This is the sixth consecutive week that an excess in the ratio of P&I deaths was recorded from the 121 reporting cities. Reported by Respective state epidemiologists and laboratory directors; U.S. Air Force School of Aerospace Medicine; Div of Surveillance and Epidemiologic Studies, Epidemiology Program Office, WHO Collaborating Center for Influenza, Influenza Br, Div of Viral Diseases, Center for Infectious Diseases, CDC.

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