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American Journal of Epidemiology Vol. 131, No. 2: 356-364
Copyright © 1990 by The Johns Hopkins University School of Hygiene and Public Health

research-article

THE EFFECT OF A CONTROL PROGRAM FOR ENZOOTIC BOVINE LEUKOSIS

CHANGES IN HERD PREVALENCE IN DENMARK, 1969–1978

A. GOTTSCHAU1,, P. WILLEBERG2, C. E. FRANTI3 and J. C. FLENSBURG4

1Department of Mathematics, Royal Veterinary and Agricultural University Denmark
2Department of Forensic and State Veterinary Medicine, Royal Veterinary and Agricultural University Denmark
3Department of Epidemiology and Preventive Medicine, School of Vetermary Medicine, University of California Davis, CA
4Danish Veterinary Service Copenhagen, Denmark

Reprint requeste to Adam Gottschau, Department of Mathematics, Royal Veterinary and Agricultural University, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Denmark

As part of the Danish control program for enzootic bovine leukosis, three hematologic screenings of all cattle herds in Denmark were performed in the period 1969–1978. Herds with multiple cases of persistent lymphocytosis and/or leukotic tumors were classified as "leukosis herds." During nationwide blood testing, 369 leukosis herds were discovered, and an additional 77 herds were found due to follow-up of tumor cases or special testing in connection with movements of cattle in 1969–1978. In the present study, the prevalence of leukosis herds in the three screening rounds is related to geographic area and herd size. By means of a statistical log-linear model, the authors show that prevalence increased proportionally with herd size. The observed number of leukosis herds per 10,000 herds tested declined during the screening program from 105 to 38 in east Denmark and from 12 to 4 in west Denmark.

cattle diseases; disease outbreaks; oncogenic viruses


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