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Influenza Update -- United States

Colorado. The first reported domestic outbreak of influenza in the United States for the 1987-88 season occurred in November among children attending a preschool in Colorado.* The index case occurred in a 3-1/2-year-old boy with a history of asthma. On November 12, he became febrile (38.8 degrees C (102 degrees F)) and had a cough. He was hospitalized on November 18 because his symptoms had become more severe. Influenza A(H3N2) was isolated from a culture collected on the patient's admission to the hospital. The child's condition improved, and he was discharged on November 20. Further investigation revealed that an outbreak of influenza-like illness had occurred among the child's preschool classmates during the first 2 weeks of November. The outbreak peaked on November 12, when 10 (67%) of the 15 children were absent. None of the other children were hospitalized. Surveillance in the surrounding community revealed no increase either in school absenteeism or in physician reports of outpatient visits for influenza-like illness.

Other reports. For the report week ending December 19, 3 states** reported regional activity of influenza-like illness. So far this season, influenza A(H3N2) has been the predominant strain. Ten states*** have now reported isolates of influenza A(H3N2) virus. Influenza A, subtype pending, has also been reported from Hawaii, Louisiana, Utah, and Washington. Sporadically occurring cases of influenza B were reported in Arizona during October and in Hawaii during October and November. One case of influenza B has been reported recently from Tennessee. There have been no reports of influenza A(H1N1) virus isolates so far this season. Reported by: K Dallow, MD, Eaton; P Graves, G Meikeljohn, MD, Univ of Colorado Health Sciences Center, Denver; A Scott, RE Hoffman, MD, MPH, State Epidemiologist, Colorado Dept of Health. P Palmer, C Edwards, Vanderbilt Univ Medical Center, Nashville, Tennessee. E Swierkosz, St. Louis Univ Medical Center, Missouri. Influenza Research Center, Baylor College of Medicine, Houston, Texas. Participating State and Territorial Epidemiologists and State Laboratory Directors. WHO Collaborating Center for Influenza, Influenza Br, Div of Viral Diseases, Center for Infectious Diseases, CDC.

Reference

  1. Centers for Disease Control. Outbreak of influenza-like illness in a tour group--Alaska. MMWR 1987;36:697-8,704. *This represents the first reported domestic outbreak in the United States, although an outbreak of influenza-like illness among members of a tour group in Alaska was previously reported (1). **Alabama, South Dakota, and Utah. *** California, Colorado, Florida, Missouri, North Dakota, South Dakota, Texas, Tennessee, Wisconsin, and Wyoming.

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**Questions or messages regarding errors in formatting should be addressed to mmwrq@cdc.gov.

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