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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