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Epidemiologic Notes and Reports Update: Influenza Activity - - United States

Influenza viruses have been isolated in all states and the District of Columbia during the 1986-87 season; 49 states* and the District of Columbia have reported at least one isolate of influenza type A/Taiwan/86(H1N1). Most states are now reporting declining activity. The peak level of outbreak activity occurred in mid-January when 28 states reported outbreaks. Activity this season was below the peak of the previous winter when 37 states reported outbreaks for 1 week in February. For the week ending February 21, only two states** reported widespread outbreaks of influenza-like illness, and 11 statesS and Puerto Rico reported regional outbreaks.

The percentage of deaths associated with pneumonia and influenza (P&I) reported from the 121 cities reporting regularly to CDC reached a peak of 6.2% for the week ending January 24, 1987. Although this percentage exceeded the epidemic threshold (Figure 1), it was below the peak reported for the previous two epidemic seasons, in which the percentage of deaths associated with P&I reached 7.2% and 6.6% respectively. This mortality surveillance system indicates a slight increase in P&I deaths at a time corresponding with the peak of influenza A/Taiwan/86 activity. Reported by State and Territorial Epidemiologists; State Laboratory Directors; WHO Collaborating Center for Influenza, Influenza Br, Div of Viral Diseases, Center for Infectious Diseases, CDC. *Wyoming has not reported A/Taiwan/86 influenza. **Idaho and South Dakota. SArkansas, Connecticut, Iowa, Kansas, Mississippi, Missouri, Nebraska, North Dakota, Pennsylvania, Texas, and Wisconsin.

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