In:
Journal of the American Veterinary Medical Association, American Veterinary Medical Association (AVMA), Vol. 217, No. 9 ( 2000-11-01), p. 1361-1365
Kurzfassung:
Objective —To determine the epidemiologic plausibility
of a sylvatic transmission cycle for Neospora caninum between wild canids and beef cattle. Design —Spatial analysis study. Animals —1,009 weaned beef steers from 94 beef
herds in Texas. Procedure —Calves were grouped on the basis of
seroprevalence for N caninum and ecologic region in
Texas. The Morans I test was used to evaluate spatial interdependence for adjusted seroprevalence by ecologic
region. Cattle density (Number of cattle/259 km2 [Number of cattle/100 mile 2 ] of each ecologic region) and abundance indices for gray foxes and coyotes
(Number of animals/161 spotlight-transect [census] km
[Number of animals/100 census miles] of each ecologic
region) were used as covariates in spatial regression models, with adjusted seroprevalence as the outcome
variable. A geographic information system (GIS) that used similar covariate information for each county was
used to validate spatial regression models. Results —Spatial interdependence was not detected
for ecologic regions. Three spatial regression models were tested. Each model contained a variable for cattle
density for the ecologic regions. Results for the 3 models revealed that seroprevalence was associated
with cattle density and abundances of gray foxes, coyotes, or both. Abundances of gray foxes and coyotes
were collinear. Results of a GIS-generated model validated these spatial models. Conclusions and Clinical Relevance —In Texas, beef
cattle are at increased risk of exposure to N caninum as a result of the abundance of wild canids and the
density of beef cattle. It is plausible that a sylvatic transmission cycle for neosporosis exists. ( J Am Vet
Med Assoc 2000;217:1361–1365)
Materialart:
Online-Ressource
ISSN:
0003-1488
DOI:
10.2460/javma.2000.217.1361
Sprache:
Unbekannt
Verlag:
American Veterinary Medical Association (AVMA)
Publikationsdatum:
2000
ZDB Id:
2904887-4
SSG:
22
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