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Update: Influenza Activity -- United States

Influenza virus type A(H3N2) has been isolated from persons with influenza-like illnesses in outbreaks in Sacramento, California, New York City, and Illinois.

In Sacramento, a kindergarten teacher developed influenza-like illness on December 2, 1984, and similar illness in her husband and son developed on December 5. Also, beginning on December 5 and continuing to December 10, an outbreak of influenza-like illness among her students increased the class absentee rate to 50%. Throat swabs from the teacher and her husband and son were collected on December 7. The class was not tested. An influenza type A(H3N2) virus was isolated from the teacher's son.

In New York City, six type A(H3N2) influenza viruses were isolated from inmates at Rikers Island Prison in December. Five isolates were recovered from young adults in the adolescent detention unit of Rikers Island Prison who had influenza-like illnesses from December 17 to December 19. During the outbreak, the number of patients on sick call with upper respiratory illnesses increased from approximately five to 20 daily. In addition, seven type A(H3N2) influenza virus isolates were identified from elderly patients at an extended-care facility in New York City who had influenza-like illnesses in an outbreak that began in mid-December. From December 20 to December 28, there were 30 patients with influenza-like illnesses among the approximately 500 nursing-home residents.

In Illinois, two type A(H3N2) isolates were collected from students in school outbreaks that took place in mid-December in two counties outside Springfield. Four type A(H3N2) isolates were identified from students at the Chicago campus of Loyola University who reported to the student health center in December. Approximately 170 patients and staff members at the Hines Veterans Administration Hospital in Chicago had influenza-like illness in an outbreak that began in mid-December. Type A(H3N2) viruses were identified from each of the five specimens tested in the outbreak.

Isolates of influenza virus type A(H3N2) from sporadic cases have also recently been reported from Arizona, Colorado, Florida, New Jersey, and New Mexico. Type A(H3N2) isolates were reported from Utah in conjunction with school outbreaks in December. Twelve states have now reported isolates of type A(H3N2) influenza virus this season (Arizona, California, Colorado, Florida, Illinois, Nevada, New Jersey, New Mexico, New York, Texas, Utah, and Wisconsin). One type A(H1N1) isolate from Houston, Texas, and type B influenza virus isolates from Hawaii, Illinois, Ohio, and Texas have also been identified. Reported by P Hom, MD, Sacramento County Health Dept, California Dept of Health Svcs; V Tucci, C Singer, MD, Long Island Jewish Hospital, Nassau County Health Dept, Long Island, D Bucher, PhD, Mt Sinai School of Medicine, H Neu, MD, Columbia Presbyterian Hospital, J Hayes, F Silverstone, MD, New York City, I Spigland, MD, R Cohen, MD, Montefiore Medical Center, New York City, S Beatrice, PhD, S Friedman, MD, New York City Dept of Health; B Haslam, Utah Dept of Health, M Beem, MD, Univ of Chicago Medical School, C Pachuki, MD, Hines Veterans Administration Hospital, M Wu, MD, Loyola University, Chicago, R Murphy, PhD, Illinois Dept of Public Health; C Linnemann, MD, Univ of Cincinnati Hospital, Ohio; P Gross, MD, Hackensack Medical Center, New Jersey; G. Meiklejohn, MD, University of Colorado, Denver; E Buff, MS, S Lieb, MS, F Wellings, PhD, Florida Dept of Health and Rehabilitative Svcs; State Epidemiologists and Laboratory Directors; Influenza Br, Div of Viral Diseases, Center for Infectious Diseases, CDC.

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