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Update: Influenza -- United States

Since mid-December 1982, influenza outbreaks have been confirmed by virus isolation in Michigan and Minnesota. At a nursing home in Genesee County, Michigan, 19 (11%) of 167 residents have experienced influenza-like illness since December 13, and three type A(H3N2) viruses have been isolated from four respiratory specimens. In Crawford County, Michigan, 26% and 21% absenteeism rates associated with influenza-like illness have been reported in an elementary school and a high school, respectively; five type A(H3N2) viruses have been isolated.

A virus isolate in Minnesota was recovered from a 2-year-old child in a Hennepin County day-care center, where about 40% of the approximately 100 children have experienced influenza-like illness since December 6. Several central Minnesota schools reported increased absenteeism due to influenza-like illness just before the winter vacation.

Since October, influenza type A(H3N2) viruses have been isolated in 15 states (Alaska, Arizona, Georgia, Hawaii, Michigan, Minnesota, Montana, New York, Oregon, Pennsylvania, Tennessee, Texas, Utah, Virginia, and Washington) and outbreaks or community spread reported in five states (Alaska, Michigan, Minnesota, Montana, and New York). Through the end of 1982, pneumonia and influenza deaths reported from 121 cities indicated no significant elevation. All virus isolates submitted to CDC for characterization have been influenza type A(H3N2) closely related to A/Bangkok/1/79 (H3N2). Reported by W Moon, MD, Crawford County, B Berman, MD, Genesee County, Michigan; C Hedberg, V Thelen, Hennepin County, Minnesota; State Laboratory Directors and State Epidemiologists, Consolidated Surveillance Activity, Epidemiology Program Office, WHO Collaborating Center for Influenza, Influenza Br, Div of Viral Diseases, Center for Infectious Diseases, CDC.

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