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Update: Influenza Activity -- United States

Although influenza type A(H3N2) virus isolates from 42 states have accounted for more than 90% of influenza isolates reported to CDC this season (1), in recent weeks, influenza type A(H1N1) virus has been reported from 20 states (Figure 1). Influenza type B has now been reported from 12 states (California, Kansas, Kentucky, Maine, Minnesota, Nebraska, New York, Ohio, Pennsylvania, South Dakota, Texas, and Wisconsin).

Influenza morbidity reports collected weekly from each state continue to indicate a decline in activity. For the week ending March 25, 1983, three states (Iowa, Nebraska, and Kentucky) reported widespread activity, and seven states reported regional activity. For the same week, an excess in the ratio of pneumonia and influenza (P&I) deaths to total deaths was reported from 121 cities for the eleventh consecutive week. The observed ratio was 5.2, and the expected ratio was 4.1 Reported by Respective state epidemiologists and laboratory directors; Div of Surveillance and Epidemiologic Studies, Epidemiology Program Office, Epidemic Investigations Br, Hospital Infections Program, Statistical Svcs Activity, WHO Collaborating Center for Influenza, Influenza Br, Div of Viral Diseases, Center for Infectious Diseases, CDC.


  1. CDC. Update: Influenza activity--United States. MMWR 1983;32(11):146-7.

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