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American Journal of Epidemiology Vol. 112, No. 6: 798-813
Copyright © 1980 by The Johns Hopkins University School of Hygiene and Public Health
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IMPACT OF EPIDEMIC TYPE A INFLUENZA IN A DEFINED ADULT POPULATION
1 Department of Preventive Medicine, University of Rochester School of Medicine and Dentistry, 601 Elmwood Avenue Rochester, NY 14642
2 Kaiser-Permanente Health Services Research Center Portland, OR
1address for reprint requests
The authors studied the occurrence of excess morbidity and mortality among subsets of the adult population (persons over 14 years of age) of a large prepaid group practice during two epidemics of type A influenza (19681969 and 19721973). The experience from 19701971, a nonepidemic year, was used as a reference for estimating excesses. Ambulatory visits for influenza and influenza-related acute respiratory disease increased by 57 visits per 100 persons (3050% excess) and pneumonia and influenza (P&l) hospitalization rates increased by 7986 per 100, 000 (140150% excess) over the rates in the nonepidemic period. There were 1113 excess deaths per 100, 000 population, most of which involved persons over 65 years of age. Excess rates of ambulatory visits were similar for all adult age groups. Excess rates of persons hospitalized with P&l ranged from 2325 per 100, 000 among non-high risk persons aged 1544 years to 150172 per 100, 000 among persons over age 65 years without underlying "high risk" conditions and 476636 per 100, 000 persons over 65 with underlying "high risk" conditions. These data provide a basis for increasing the precision of clinical and public decision-making regarding the prevention of serious consequences of epidemic influenza.
chronic disease; health maintenance organizations; hospitalization; hospitals, group practice; influenza; morbidity; mortality; pneumonia
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