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Current Trends Influenza Update -- United States

Influenza virus isolates from patients with sporadic cases of respiratory illness continue to be reported. An influenza type B isolate, the first from Michigan this season, was obtained in Ann Arbor from a college student, who had onset of influenza in the last week of January. Further isolations of influenza A(H1N1) and B in mid and late January have been reported from Houston: the seasonal totals from Houston now include 7 type A and 68 type B isolates. Influenza type B virus was also isolated on January 27 from a 15-year-old patient with respiratory illness in Phoenix, Arizona. This was the first isolate of the season reported from Phoenix.

Tucson is the only locality in the United States with current respiratory illness that is reporting influenza isolates. Influenza B has been isolated sporadically this season in the following states: Arkansas, California, Colorado, Hawaii, Michigan, Nevada, New Mexico, New York, Texas, and Wisconsin. Influenza A(H1N1) has been isolated sporadically in California, New Jersey, Texas, and Utah. Influenza B isolates tested at CDC resemble B/Singapore/222/79, and influenza A(H1N1) isolates resemble A/England/333/80. Reported by A Monto, MD, University of Michigan, Ann Arbor, W Hall, MD, N Hayner, MD, State Epidemiologist, Michigan Dept of Public Health; K Starko, MD, Maricopa County, J Sarn PhD, J Sacks, State Epidemiologist, Arizona Dept of Health Svcs; P Glezen, MD, Influenza Research Center, Houston, C Webb, Jr, MD, State Epidemiologist, Texas Dept of Health; Immunization Div, Center for Prevention Svcs, Influenza Br, Viral Diseases Div, Center for Infectious Diseases, CDC.

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