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Update: Influenza Activity -- United States

The first influenza type B outbreak this season has recently been documented in a 175-bed facility for elderly patients in Portland, Maine, where increases in influenza-like illness were noted in late January and continued through early March. Approximately 45% of the residents had influenza-like illnesses during the outbreak; six were affected by x-ray-documented pneumonia, and three others died following influenza-like illness. Six influenza type B isolates have been obtained from patients at this facility and identified at the Maine state health laboratory and at CDC.

Arkansas and New Jersey have recently reported their first influenza virus isolates of the season; both were type A(H3N2).

For the week ending March 11, 1983, an excess in the ratio of pneumonia and influenza (P&I) deaths to total deaths was reported from 121 cities for the ninth consecutive week. The ratio was 5.3, and the expected ratio was 4.2. Five states (Iowa, Kentucky, Missouri, Nebraska, and Virginia) reported widespread influenza activity, and 11 states reported regional activity. Reported by B Zolov, MD, Portland, A Littlefield, E Cotton, M Duplessis, T Lee, PhD, Maine State Dept of Human Svcs; Respective state epidemiologists and laboratory directors; Div of Surveillance and Epidemiologic Studies, Epidemiology Program Office, Epidemic Investigations Br, Hospital Infections Program, WHO Collaborating Center for Influenza, Influenza Br, Div of Viral Diseases, Center for Infectious Diseases, CDC.

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