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Update: Influenza Activity -- United States

Influenza viruses continue to be isolated by laboratories in all areas of the United States, and one or more state health departments in each region now indicate influenza activitiy has increased beyond sporadic levels.

Isolates have been reported from 36 states, including those shown earlier (1) and Maryland, New Mexico, and Vermont, which have now reported their first isolates of the season. The number of influenza isolates obtained by the reporting laboratories has increased since January 1 and now totals 276 (Figure 1). Most of the virus isolates have been identified as type A(H3N2) related to the Bangkok/79 component of the current vaccine. Seven H1N1 isolates have been identified from sporadic cases in California, Illinois (4 cases), Minnesota, and Wisconsin, and three influenza type B isolates have been identified from sporadic cases in Ohio, Nebraska, and Texas.

An excess in the ratio of deaths from pneumonia and influenza (P&I) to total deaths was reported from 121 cities for the fourth consecutive week (Figure 1). The ratio of P&I deaths for the week ending February 5, 1983, was 5.0 and the expected ratio was 4.1. Three states (Minnesota, Oklahoma, and Texas) reported widespread influenza activity for that same week. Reported by Respective State Epidemiologists and Laboratory Directors; Consolidated Surveillance Activity, Epidemiology Program Office, Influenza Br, Div of Viral Diseases, Center for Infectious Diseases, CDC.


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

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