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Current Trends Update: Influenza Activity -- United States

Influenza outbreaks continue to be widely reported throughout the United States. For the week ending February 14, 1986, 19 states* and the District of Columbia reported widespread outbreaks of influenza-like illness, and 18 states** reported regional outbreaks. This is the second consecutive week with more states reporting outbreaks than for any week since January 1981. Preliminary tallies of patients with influenza-like illnesses seen by the network of family physiciansS nationwide averaged 11.5 cases for the reporting week ending February 5, compared with the 10.8 average for the preceding week and the maximum 11-12 cases for the two preceding seasons.

The numbers of influenza viruses isolated by the collaborating diagnostic laboratories continued to increase, with 83% of the reports for the 2 most recent weeks represented by type B, and 17%, by type A(H3N2). Maine (type B virus) and Vermont (virus types A(H3N2) and B) reported their first influenza isolates of the season. Forty-three states have now reported type B virus isolates; 26 states, type A(H3N2) isolates; and 25 states, both types.

The percentage of pneumonia and influenza deaths reported from the 121 U.S. cities for the week ending February 14 was 6.2%, compared with the 5.8% for the preceding 2 weeks. Reported by State and Territorial Epidemiologists; State Laboratory Directors; Statistical Svcs Br, Div of Surveillance and Epidemiologic Studies, Div of Field Svcs, Epidemiology Program Office, WHO Collaborating Center for Influenza, Influenza Br, Div of Viral Diseases, Center for Infectious Diseases, CDC. *Colorado, Georgia, Idaho, Iowa, Kansas, Louisiana, Montana, Nebraska, New Hampshire, New Jersey, North Carolina, Pennsylvania, South Carolina, South Dakota, Vermont, Virginia, Washington, Wisconsin, and Wyoming. **Alabama, Arizona, California, Connecticut, Delaware, Illinois, Maine, Maryland, Michigan, Minnesota, Mississippi, North Dakota, Ohio, Oklahoma, Oregon, Rhode Island, Tennessee, and Texas. SCases reported by those members of the American Academy of Family Physicians Research Panel who serve as sentinel physicians for influenza.

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