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Update: Influenza Activity -- United States

For the week ending February 16, 1985, 11 states (Florida, Hawaii, Nebraska, New Hampshire, New Mexico, Oklahoma, Pennsylvania, South Carolina, South Dakota, Texas, and Virginia) and the District of Columbia reported widespread outbreaks of influenza-like illness, and 17 states reported regional outbreaks.

Trends of influenza activity are represented in Figure 1. Family physicians who report weekly to CDC noted an average of 9.7 cases of influenza-like illness for the reporting week ending February 6, compared with the average of 6.6 cases at the beginning of January.

Of total deaths reported from 121 U.S. cities, the percentage associated with pneumonia and influenza (P&I) was 6.8% for the week ending February 16 and 6.9% for the preceding week. This compares with recent seasons when the P&I percentage exceeded 6%: in 1981, the P&I percentage peaked at 6.9%, and in 1976, at 7.7%. On both occasions, many outbreaks of influenza associated with type A(H3N2) strains were in progress.

The total number of type A(H3N2) virus isolates reported to CDC from the network of WHO Collaborating Laboratories in the United States has increased sharply for the reporting weeks ending January 26 and February 2. Including recent reports from Maine and Vermont, influenza type A(H3N2) isolates have so far been reported from 44 states. Type B isolates have accounted for only nine of the 707 isolates reported by the collaborating laboratories. Reported by TK Lee, PhD, Bureau of Health, Maine Dept of Human Svcs; L Orciari, P Pelletier, MS, Vermont Dept of Health; 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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