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Update: Influenza Activity -- United States

Influenza virus activity continues in all regions of the United States. An excess in the ratio of deaths from pneumonia and influenza (P&I) to total deaths was recorded from 121 cities for the fifth consecutive week. The ratio of P&I deaths for the week ending February 12, 1983, was 4.8, and the expected ratio was 4.1. Four states (Nebraska, New Hampshire, Oklahoma, and Texas) reported widespread influenza activity for that same week.

Delaware has now reported its first influenza isolation of the season, making a total of 37 states with reported influenza isolates (1,2). Most of the virus isolates have been identified as type A(H3N2) related to the Bangkok/79 component of the current vaccine. However, influenza type A(H1N1) virus has been isolated from sporadic cases in Arizona, California, Illinois, Minnesota, Texas, and Wisconsin. Influenza type B virus has been isolated from sporadic cases in California, Nebraska, Ohio, and Texas. Reported by Respective state epidemiologists and laboratory directors; Consolidated Surveillance Activity, Epidemiology Program Office, Influenza Br, WHO Collaborating Center for Influenza, Div of Viral Diseases, Center for Infectious Diseases, CDC.


  1. CDC. Update: influenza virus activity--United States, Canada. MMWR 1983;32:59-60.

  2. CDC. Update: influenza activity--United States. MMWR 1983;32:75-6.

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