Bayesian Estimation of the True Bovine Brucellosis Prevalence in Vaccinated and Non-Vaccinated Ecuadorian Cattle Populations, and the Sensitivity and Specificity of a Competitive and Indirect ELISA Using a New Synthetic Antigen.
[en] Bovine brucellosis (bB) is a zoonosis mainly caused by the Brucella abortus species in cattle. Bovine brucellosis can present with either a range of clinical symptoms, including spontaneous abortions in the last trimester of pregnancy, retained fetal membranes, and decreased milk production, or it can be asymptomatic. In Ecuador, vaccination against bB with S19 and/or RB51 is not mandatory and is the responsibility of the farmer. As serology is a convenient method for detecting antibodies against Brucella, evaluating the diagnostic performance and discriminative ability of such tests in various epidemiological settings is required. To estimate and compare the diagnostic sensitivity (Se) and specificity (Sp) of two screening tests, a new competitive (cELISA) and an indirect ELISA based on a new synthetic antigen (iELISA), a randomized, stratified, cross-sectional, serological survey was performed on the cattle population (3299 bovine sera from 223 farms) in continental Ecuador. A Bayesian approach was used to evaluate the two tests by estimating their respective diagnostic Se and Sp, as well as the true prevalence of bB in different sub-populations (non-vaccinated, vaccinated with S19 or RB51). The Se of both tests was similar across Bayesian models, with values around 94%. In contrast, the Sp of the iELISA, ranging between 97 and 98%, was significantly higher than that of the cELISA, which was approximately 94-95%. The true prevalence of bB was 1.63% (95% CrI: 0.56-2.54) in non-vaccinated cattle, decreased to 0.97% (95% CrI: 0.005-2.54) in S19-vaccinated cattle and was 2.75% (95% CrI: 0.50-5.32) in RB51-vaccinated cattle. The results of this study suggest that, with similar Se and higher Sp, the iELISA based on an innovative synthetic antigen (which is more standardizable) should be recommended as a possible screening test for bB in Ecuador. Also, the proposed approach suggests insights into the quality of the vaccination campaign and highlights the need for refining the Ecuadorian national brucellosis control program.
Disciplines :
Veterinary medicine & animal health
Author, co-author :
Garrido Haro, Ana Dolores; Agrocalidad Tumbaco, Quito 170903, Ecuador ; Research Unit of Epidemiology and Risk Analysis Applied to Veterinary Science (UREAR-ULg), Fundamental and Applied Research for Animals & Health (FARAH) Center, Faculty of Veterinary Medicine, University of Liege, 4000 Liège, Belgium
Salas Torres, Verónica Alexandra; Agrocalidad Tumbaco, Quito 170903, Ecuador
Galante Mulki, María Cristina; Agrocalidad Tumbaco, Quito 170903, Ecuador
Wielick, Constance ; Université de Liège - ULiège > Fundamental and Applied Research for Animals and Health (FARAH) > FARAH: Santé publique vétérinaire
Ron-Román, Jorge; Grupo de Investigación en Sanidad Animal y Humana (GISAH), Carrera Ingeniería Agropecuaria, Departamento de Ciencias de la Vida y la Agricultura, Universidad de las Fuerzas Armadas ESPE, Sangolquí 171103, Ecuador
Saegerman, Claude ; Université de Liège - ULiège > Département des maladies infectieuses et parasitaires (DMI) > Epidémiologie et analyse des risques appliqués aux sciences vétérinaires
Language :
English
Title :
Bayesian Estimation of the True Bovine Brucellosis Prevalence in Vaccinated and Non-Vaccinated Ecuadorian Cattle Populations, and the Sensitivity and Specificity of a Competitive and Indirect ELISA Using a New Synthetic Antigen.
This study was funded by the Academy of Research and Higher Education (ARES) through the Research for Development Project (PRD) entitled \u201CEstablishment of a support platform for training and awareness-raising, diagnostics and the development of a brucellosis and trypanosomiasis control strategy in Ecuador (acronym: BruTryp)\u201D, which involves Ecuador (Universidad de las Fuerzas Armadas ESPE) and Belgium Universities (ULi\u00E8ge and UNamur). The costs of the analyses were carried out within the framework of the surveillance of brucellosis in Ecuador, which was supported by Agrocalidad (Tumbaco, Ecuador).
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