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Epidemiologic Notes and Reports Update: Influenza Virus A(H3N2) Isolations -- United States

Three additional states, Pennsylvania, Tennessee, and Washington, as well as upstate New York, have reported influenza virus type A(H3N2) isolations. The isolates were collected from patients who had onset of influenza from mid to late November in Pittsburgh, Pennsylvania (1 case), Nashville, Tennessee (2 cases), and Skagit County, Washington (2 cases). The isolate from upstate New York was obtained from a 16-year-old female who had visited in Ottawa, Canada, for approximately 2 days, when she had onset of influenza on November 19. She returned to her home in Rochester, New York, on November 21, and a specimen was collected for virus testing on November 22.

Isolations of H3N2 influenza virus had earlier been reported from Alaska, New York City, Oregon, and Virginia (1). Alaska has widespread outbreaks of influenza, and 33 isolates of influenza virus, all H3N2, have now been identified. Isolates from other locations have been associated with sporadic cases of influenza rather than outbreaks. Reported by D Ritter, J Middaugh, MD, State Epidemiologist, Alaska Dept of Health and Social Svcs; P Wright, MD, Vanderbilt University, R Hutcheson, MD, State Epidemiologist, Tennessee State Dept of Public Health; J Sarandria, Allegheny County Health Dept, M Richards, MD, C Hayes, MD, State Epidemiologist, Pennsylvania State Dept of Health; S Mills, J Allard, PhD, State Epidemiologist, Washington State Dept of Social and Health Svcs; R Dolin, MD, R Betts, MD, C Hall, MD, Univ of Rochester, D Morse, MD, R Rothenberg, MD, State Epidemiologist, New York State Dept of Health; Influenza Br, Center for Infectious Diseases, CDC.


  1. CDC. Influenza A(H3N2) virus isolations--United States. MMWR 1982;31:638.

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