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Update: Influenza Virus Activity -- United States, Canada

United States: Through January 28, 1983, 33 states in all areas of the country have reported influenza virus isolations from residents (Figure 3). Almost all isolates have been type A(H3N2) virus, related to the A/Bangkok/l/79 component of currently available vaccine. Type A(H1N1) virus was identified from sporadic cases in two locations--Chicago, Illinois, and San Bernadino, California. Type B influenza virus has been identified from sporadic cases in Houston, Texas, and Canton, Ohio.

For the third consecutive week this season, deaths attributed to pneumonia and influenza (P & I) were elevated in 121 U.S. cities for the week ending January 28. The ratio of P & I deaths to total deaths was 5.2, compared with 4.9 the previous week.

Canada: Influenza cases have now been reported by most provinces. Laboratory-confirmed influenza A/Bangkok activity has been reported by British Columbia, Alberta, Saskatchewan, Manitoba, Ontario, Quebec, New Brunswick, Labrador, and Northwest Territories. As of January 7, 1983, 133 isolates and 91 seroconversions of influenza A/Bangkok-like (H3N2) had been reported by the provinces. By contrast, as of January 7, 1982, one isolate and seven seroconversions of influenza type A virus--some Bangkok-like and others Brazil-like--had been reported. Reported by J Baxa, Ohio State Dept of Health; L Blouse, MD, U.S. School Aerospace Medicine, San Antonio, Texas; Respective State Epidemiologists and Laboratory Directors; Canada Diseases Weekly Report, January 15, 1983;9:3; Communicable Disease Div, Bureau of Epidemiology, Laboratory Centre for Disease Control, Ottawa, Ontario, Canada; Consolidated Surveillance Activity, Epidemiology Program Office, WHO Collaborating Center for Influenza, Influenza Br, Statistics Br, Div of Viral Diseases, Center for Infectious Diseases, CDC.

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