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Update: Influenza Activity - United States

Outbreaks of influenza, noted primarily in schools and colleges, continued to be reported from all regions of the United States. From February 10 to February 17, Maryland, Ohio, Tennessee, and Utah reported their first influenza type A(H1N1) isolates for the 1983-1984 season, while Arkansas, Florida, Louisiana, Massachusetts, Michigan, Missouri, Ohio, and Pennsylvania reported their first type B isolates. Influenza type A(H1N1) virus has now been isolated in 35 states (Figure 2) and type B virus, in 28 states (Figure 3).

In the northwest, only type B virus has been isolated from influenza outbreaks in Oregon and Washington. In contrast, only type A(H1N1) virus has been isolated this season in several southeastern states, where widespread outbreaks have occurred (Alabama, Georgia, Mississippi, North Carolina, and South Carolina). Between these geographic foci, both influenza types A(H1N1) and B have been isolated, sometimes during the same outbreak. Influenza outbreaks have been only rarely documented in institutions with older residents, such as nursing homes, this season. Reported by State Epidemiologists and Laboratory Directors; Statistical Svcs Br, Div of Surveillance and Epidemiologic Studies, Epidemiology Program Office, Statistical Svcs Activity, Influenza Br, Div of Viral Diseases, Center for Infectious Diseases, CDC.

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