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Update: Influenza -- United States, through February 8, 1984

Influenza virus type A(H1N1) continues to be the most frequently reported isolate in the United States, with outbreaks in schools and colleges. Similar outbreaks in school-aged populations in Oregon, where type A(H1N1) virus has not been isolated, have been reported in association with type B virus isolates.

Thus far in the 1983-1984 season, isolates of type A(H1N1) virus have been reported from the District of Columbia and 26 states: Alabama, Alaska, Arizona, Arkansas, California, Colorado, Florida, Georgia, Hawaii, Iowa, Louisiana, Maine, Massachusetts, Michigan, Minnesota, Mississippi, Montana, Nevada, New Mexico, New York, North Carolina, Oklahoma, Pennsylvania, South Carolina, Texas, and Wisconsin, with associated outbreaks reported from Arizona, Arkansas, California, the District of Columbia, Georgia, Iowa, Louisiana, Massachusetts, Minnesota, Mississippi, New Mexico, New York, North Carolina, South Carolina, and Wisconsin. Isolates of type B virus have been reported from 19 states: Alaska, Arizona, California, Colorado, Hawaii, Illinois, Minnesota, Montana, Nevada, New Mexico, New York, Oklahoma, Oregon, Tennessee, Texas, Utah, Washington, West Virginia, and Wisconsin, with associated outbreaks reported from Minnesota and Oregon. Isolates of type A(H3N2) virus have been reported from Alaska, Arizona, New Mexico, Pennsylvania, and Tennessee; associated outbreaks were reported from Alaska at the end of 1983. Reported by D Coulter, D McNeill, L Foster, MD, Oregon Health Div; Respective State Epidemiologists and Laboratory Directors; Influenza Br, Div of Viral Diseases, Center for Infectious Diseases, CDC.

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