American Journal of Epidemiology Vol. 141, No. 6: 502-506
Copyright © 1995 by The Johns Hopkins University School of Hygiene and Public Health
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Medical Practice-based Influenza Surveillance: Viral Prevalence and Assessment of Morbidity
1Department of Epidemiology, School of Public Health, University of Michigan Ann Arbor, MI
2Department of Population Planning and International Health, School of Public Health, University of Michigan Ann Arbor, MI
Reprint requests to Dr. Arnold S. Monto, School of Public Health, University of Michigan, 109 Observatory, Ann Arbor, MI 48109-2029
Regular surveillance of influenza virus activity and associated illness is necessary to monitor changes in circulating strains. As part of a demonstration project, medical practices in a seven-county area in southern lower Michigan were recruited as sentinel surveillance sites. The practices were asked to collect specimens for virus isolation and/or data on age-specific frequency of respiratory illnesses that met a case definition. Data were used to establish periods of influenza virus activity for vaccine effectiveness determinations. Over three study periods, 1989–1992, there were documented outhreaks of influenza type A(H3N2), type A(H1N1), and type B. The incidence of influenza-like illness increased during these outbreaks, with variation in age-specific frequency from year to year. Recovery of virus was not affected during the winter season by long delays in specimen receipt by the laboratory. Results indicated that medical practices can be successfully recruited as surveillance sites to provide information on the timing, etiology, and intensity of acute respiratory illness. Am J Epldemiol 1995;141:502–6.
disease outbreaks; epidemiologic methods; influenza; morbidity; Orthomyxoviridae; population surveillance
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