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Update: Influenza Activity -- United States, Worldwide

United States: Morbidity reports collected weekly by each state indicate a continuing decline in influenza outbreaks. For the week ending April 9, 1983, 2 states (Kentucky and New Mexico) reported regional activity, and no state reported widespread activity. In recent weeks, reports of influenza virus isolations from collaborating laboratories have also indicated a decline in influenza activity (Figure 2). Most isolates (89%) continue to be type A(H3N2) virus, despite increases in influenza B and type A(H1N1). For the week ending April 9, 1983, an excess in the ratio of pneumonia and influenza (P&I) deaths to total deaths was reported from 121 cities for the thirteenth consecutive week. The observed ratio was 5.2 and the expected ratio was 4.1 (Figure 2).

Worldwide: Influenza activity during the 1982-1983 season has generally been moderate and largely associated with influenza type A(H3N2) viruses, which have been reported from all five continents since October 1982. A(H3N2) has been the type most frequently isolated in all areas of the world and has been associated with outbreaks in all age groups. Influenza type A(H1N1) isolates have been associated with sporadic cases and with outbreaks among schoolchildren. Influenza type B isolates, generally associated with sporadic cases, have been identified in several European countries. During late March and early April, influenza activity appeared to be declining in most European countries. Reported by WHO Weekly Epidemiologic Record, 1983;58(1-13); Respective state epidemiologists and laboratory directors; Div of Surveillance and Epidemiologic Studies, Epidemiology Program Office, WHO Collaborating Center for Influenza, Influenza Br, Div of Viral Diseases, Center for Infectious Diseases, CDC.

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