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Neospora caninum in beef herds in New South Wales, Australia. 1: seroprevalence study
Author(s) -
Moloney BJ,
Kirkland PD,
Heuer C
Publication year - 2017
Publication title -
australian veterinary journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.382
H-Index - 59
eISSN - 1751-0813
pISSN - 0005-0423
DOI - 10.1111/avj.12561
Subject(s) - seroprevalence , herd , neospora caninum , veterinary medicine , zoology , biology , geography , medicine , serology , antibody , toxoplasma gondii , immunology
Objective To determine the seroprevalence of Neospora caninum antibodies in beef breeding herds across New South Wales ( NSW ) and to determine if there are any differences associated with geographic location and other herd‐level factors. Methods Cross‐sectional survey of beef breeding cows (n = 3298) from 63 properties (approximately 55 cows per herd) sampled randomly from six regions in NSW using a multistage survey design. Samples were tested by ELISA for N. caninum . Seroprevalence was determined at animal and herd levels, using an analysis approach to account for stratification, sample weighting and within‐herd clustering. Results Animal‐level seroprevalence ranged from 1.8% to 11.3% across regions and the overall animal seroprevalence for NSW was 5.9%. The mean within‐herd seroprevalence was 5.2%. The herd seroprevalence ranged from 50% to 92%, with an overall point estimate for NSW of 63.8% (using ≥ 1 animal positive = herd positive). The within‐herd seroprevalence ranged from 1.6% to 32.7% Prevalence and associated confidence limits were adjusted for the design of the survey. Conclusions Overall, about two‐thirds of all herds in NSW showed evidence of infection, but the seroprevalence of N. caninum in individual beef cattle in NSW was low to moderate (1.8–11.3%). Significant differences occurred between regions. The risk for herds being positive for N. caninum was associated with geographic factors, particularly in the Mid‐North Coast Region.