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Am. J. Trop. Med. Hyg., 27(1), 1978, pp. 94-100
Copyright © 1978 by The American Society of Tropical Medicine and Hygiene

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Hydatid Disease Screening: Sanpete County, Utah, 1971–1976

Alan G. Barbour*, James R. Everett{dagger}, Ferron L. Andersen, Craig R. Nichols, Taira Fukushima AND Irving G. Kagan
Field Services Division, Bureau of Epidemiology and Parasitology Division, Bureau of Laboratories, Center for Disease Control, Public Health Service, U.S. Department of Health, Education, and Welfare, Atlanta, Georgia 30333, Bureau of Disease Prevention, Utah State Division of Health, Salt Lake City, Utah 84113, and Department of Zoology, Brigham Young University, Provo, Utah 84602

Between 1971 and 1976 approximately 20% (2,265) of the population of Sanpete County, Utah, was screened for hydatid disease (Echinococcus granulosus) by intradermal, indirect hemagglutination, and bentonite flocculation tests. Of 34 persons who had follow-up chest radiographs and radioisotope liver scans, 6 were found to have asymptomatic hepatic cysts. If a participant who had pulmonary cysts and negative screening tests were included, the prevalence of asymptomatic hydatid disease would be 3 per 1,000. During the same period, 82 (148 per 1,000) of 553 dogs successfully purged and examined had E. granulosus infections. Human cyst carriage was associated with dog ownership, particularly of infected dogs or in conjunction with sheep raising as the main livelihood. Combinations of immunodiagnostic tests were more efficacious in identifying cyst carriers than the tests used singly. Limitation of screening to high risk groups (e.g., sheep raisers with dogs) can reduce costs without reducing yield. Optimum management of the cyst carrier awaits further information on the natural history of asymptomatic hydatid disease.

Accepted for publication June 25, 1977.


* Present address: Division of Infectious Diseases, Department of Medicine, University of Utah Medical Center, Salt Lake City, Utah 84132.


{dagger} Present address: Clinical Oncology Division, V.A. Hospital, Boston, Massachusetts 02130.






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Copyright © 1978 by the American Society of Tropical Medicine and Hygiene.