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Subtype of Influenza A Isolates -- United States

Influenza A viruses isolated in October from two patients in California and one patient in South Dakota (1) have been confirmed by the WHO Collaborating Center for Influenza, CDC, as subtype (H3N2). Identification of the subtype for two isolates from Wyoming is pending. The cases in California occurred in an 83-year-old woman who had been touring China and the 62-year-old physician who treated her upon her return to the United States.

Colorado has reported its first isolate of influenza A(H3N2), recovered from a specimen collected from a 3-year-old child who became ill in late November. For the week ending November 21, 18 states reported sporadically occurring cases of influenza-like illness. No outbreaks of influenza-like illness have been reported thus far this season. Reported by: Participating State Epidemiologists and Laboratory Directors. Influenza Virus Laboratory, Univ of Colorado Health Science Center, Univ of Colorado, Denver. Div of Field Svcs, Epidemiology Program Office; WHO Collaborating Center for Influenza, Influenza Br, Div of Viral Diseases, Center for Infectious Diseases, CDC.

Reference

  1. Centers for Disease Control. Influenza A isolates--United States, 1987. MMWR 1987;36:751.

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