Abstract: A cross-sectional study was conducted to determinate the seroprevalence rate of equine brucellosis in the state of Tamaulipas, Mexico. Serum samples from 420 equines were analyzed with the Rose Bengal test at cell concentrations of 3% (RBT-3%) and 8% (RBT-8%), and positive results were confirmed with the Rivanol test (RT). Risk factors were determined with the prevalence ratio (PR) and the use of variables generated from a questionnaire administered to the animals' owners. Serum from 1 stallion had positive results with both the RBT-8% and the RT, for a seroprevalence rate of 0.238%. Drinking of water from a pond that was also used by cattle and dogs was the only associated risk factor for this animal (PR = 0.25). However, the results were considered false-positive, because the results for other horses in the same environmental conditions were negative. Although brucellosis is considered endemic in ruminants in the study area, the results obtained suggest that equines are not a reservoir of brucellosis and do not play an important role in the epidemiologic patterns of this disease in northeastern Mexico. Une étude transversale a été effectuée dans l’état de Tamaulipas au Mexique afin de déterminer le taux de séroprévalence de la brucellose équine. Des échantillons de sérum provenant de 420 chevaux ont été analysés par l’épreuve du Rose de Bengale à une concentration cellulaire de 3 % (RBT-3 %) et 8 % (RBT-8 %) et les résultats positifs ont été confirmés par l’épreuve du Rivanol (RT). Les facteurs de risque ont été déterminés à l’aide des ratios de prévalence (PR) et l’utilisation de variables générées à partir d’un questionnaire soumis aux propriétaires des animaux. L’échantillon de sérum d’un étalon a donné un résultat positif aux épreuves RBT-8 % et RT, pour un taux de séroprévalence de 0,238 %. La prise d’eau à partir d’un étang utilisé également par des bovins et des chiens a été le seul facteur de risque associé à cet animal (PR = 0,25). Toutefois, les résultats ont été considérés comme étant un faux-positif compte tenu du fait que les résultats des autres chevaux gardés dans les mêmes conditions s’étaient avérés négatifs. Bien que la brucellose soit considérée comme endémique chez les ruminants de la région étudiée, les résultats obtenus suggèrent que les chevaux ne sont pas un réservoir de brucellose et ne joue pas un rôle important dans le patron épidémiologique de la maladie dans le nord-est du Mexique. (Traduit par Docteur Serge Messier)
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This research investigated the prevalence of Brucella abortus antibodies in horses in Tamaulipas, Mexico, and concluded that horses do not play a significant role in the epidemiology of brucellosis in this region.
Method of Investigation
The study employed a cross-sectional design to determine the prevalence rate of equine brucellosis in the Tamaulipas region of Mexico.
The researchers used the Rose Bengal test at different cell concentrations (3% and 8%) to analyze serum samples collected from 420 horses. Positive results from this test were then confirmed using the Rivanol test.
Additional data was collected through a questionnaire given to the owners of the horses to identify potential risk factors for the disease, these factors were then assessed using prevalence ratio (PR) calculations.
Findings and Interpretation
The research identified one stallion with a positive test result for Brucella abortus antibodies at a cell concentration of 8% using the Rose Bengal test and this result was confirmed by the Rivanol test – a seroprevalence rate of 0.238% for the total samples.
The identified risk factor for this particular stallion was its consumption of water from a pond that was used by cattle and dogs as well.
However, the researchers considered this single positive result to be a probable false positive as other horses that shared the same environmental conditions did not test positive for brucellosis.
Conclusion and Implications
The study concluded that horses are not a reservoir for Brucella abortus, despite brucellosis being an endemic disease among ruminants in the study area.
It further implies that horses do not play a significant role in the epidemiological patterns or spread of brucellosis in this region of northeastern Mexico.
The results of this study have important implications for veterinary practices and public health measures targeting the prevention and control of brucellosis in this area.
Cite This Article
APA
Acosta-González RI, González-Reyes I, Flores-Gutiérrez GH.
(2006).
Prevalence of Brucella abortus antibodies in equines of a tropical region of Mexico.
Can J Vet Res, 70(4), 302-304.
Unidad Académica Multidisciplinaria Reynosa-Aztlán, Universidad Autónoma de Tamaulipas, Calle 16 y Lago de Chapala, Colonia Aztlán, Reynosa, Tamaulipas, Mexico.
González-Reyes, Ismael
Flores-Gutiérrez, Gerardo H
MeSH Terms
Animal Husbandry / methods
Animals
Antibodies, Bacterial / blood
Brucella abortus / immunology
Brucellosis / epidemiology
Brucellosis / veterinary
Cross-Sectional Studies
Disease Reservoirs / veterinary
Equidae
Female
Horse Diseases / epidemiology
Horses
Male
Mexico / epidemiology
Risk Factors
Rose Bengal
Seroepidemiologic Studies
Surveys and Questionnaires
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