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Update: Influenza Activity -- United States

Recent data from leading indicators show static or declining levels of influenza activity. The average number of cases of influenza-like illness reported by family physicians for the reporting week ending February 20, 1985, was 8.2, continuing the trend since the apparent peak of 11.2 cases for the reporting week ending January 30. The preliminary total of influenza virus isolates reported for the week ending February 22 was 197, a decrease from the approximately 250 isolates reported for each of the preceding 3 weeks. A total of 21 states indicated the occurrence of widespread or regional outbreaks of influenza-like illness for the week ending March 2, compared with the 26 states that indicated similar levels for the preceding week (Figure 1).

Of total deaths reported from 121 cities for the week ending March 2, 7.3% were associated with pneumonia or influenza (P&I), unchanged from the preceding week. Changes in numbers of P&I deaths typically lag behind morbidity indices. Reported by Participating physicians of the American Academy of Family Physicians; State and Territorial Epidemiologists; State Laboratory Directors; Other collaborating laboratories; Statistical Svcs Br, Div of Surveillance and Epidemiologic Studies, Epidemiology Program Office, Influenza Br, Div of Viral Diseases, Center for Infectious Diseases, CDC.

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