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Epidemiologic Notes and Reports Influenza Update -- United States

Influenza A(H1N1) virus has been isolated from 1 of 2 patients surveyed in a focal outbreak of influenza at a juvenile correction institution in Sacramento, California. An estimated 40%-50% of the 100 inmates were affected. An additional 4 isolates of influenza A(H1N1) virus and 3 of type B virus, all associated with geographically scattered cases, were reported from California. Two influenza A(H1N1) viruses and 1 type B virus have been isolated in Oregon, the first for that state this season. The isolations were associated with sporadic influenza cases occurring in late January or early February. Influenza activity in Tucson, Arizona, has declined. School absenteeism in Tucson has returned to normal levels, and influenza virus was not isolated there during the first 2 weeks of February. The largest number of virus isolations continues to be reported from Houston, Texas, where the Influenza Research Center has identified a total of 159 type B and 21 type A(H1N1) influenza viruses this season through active clinical surveillance. Despite the large number of isolations, no outbreaks of influenza have been documented in Houston. Reported by P Hom, MD, Sacramento County Health Dept, J Chin, MD, State Epidemiologist, California State Dept of Health Svcs; W Murphy, PhD, J Googins, MD, State Epidemiologist, Oregon Dept of Human Resources; R Worrell, RN, P Noland, MD, Pima County Health Dept, L Minnich, G Ray, MD, University Hospital, Tucson, J Sacks, MD, Acting State Epidemiologist, Arizona Dept of Health Svcs; P Glezen, MD, Influenza Research Center, Baylor College of Medicine, Houston, C Webb Jr, MD, State Epidemiologist, Texas Dept of Health; WHO Collaborating Center for Influenza, Center for Infectious Diseases, CDC.

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