Abstract:
: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.
journal_name
Am J Epidemioljournal_title
American journal of epidemiologyauthors
Gottschau A,Willeberg P,Franti CE,Flensburg JCdoi
10.1093/oxfordjournals.aje.a115505subject
Has Abstractpub_date
1990-02-01 00:00:00pages
356-64issue
2eissn
0002-9262issn
1476-6256journal_volume
131pub_type
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