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Evaluation of Risk Factors Associated With Herds With an Increased Duration of Bovine Tuberculosis Breakdowns in Castilla y Leon, Spain

Frontiers in veterinary science publish this investigation article

September 25th, 2020

The persistence of bovine tuberculosis (bTB) in certain cattle herds is a major concern in countries pursuing disease eradication worldwide. The chronic nature of the disease, the lack of performance of diagnostic tools, and the presence of wildlife reservoirs may lead infected herds to require longer periods to achieve the officially tuberculosis-free (OTF) status. Here, we evaluated the impact of farm and breakdown characteristics on the probability of disease persistence in infected farms in Castilla y Leon, a bTB-endemic region of Spain, using survival and logistic regression models. Data from bTB breakdowns occurring in 3,550 bTB-positive herds detected in 2010–2017 were analyzed. A multivariable Cox proportional hazards model was fitted using time to recover OTF status as the response variable, and a multivariable logistic regression model using the chronic status (yes/no) for herds experiencing particularly long breakdowns as the outcome variable was also used. Both analyses revealed that county-level bTB herd prevalence, herd size, number of incoming animals in the previous 3 years, number of skin test reactors in the disclosing test, and number of days between the disclosing and follow-up tests were associated with increased breakdown duration. Production type was not consistently associated with chronic infection, suggesting that once infected, it is not a significant predictor of outbreak duration beyond the initial stages of the breakdown. Province-level location and number of animals that are bacteriology-positive also affected significantly the expected herd breakdown duration, but their effect became less significant over time. Risk factors identified in this study may help to identify herds more prone to suffer chronic bTB infection that may require additional control measures early on in a breakdown




Pozo P., Romero B., Bezos J., Grau A., Nacar J., Saez JL., Minguez O. and Alvarez J..




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Evaluation of Risk Factors Associated With Herds With an Increased Duration of Bovine Tuberculosis Breakdowns in Castilla y Leon, Spain




Participants:

Universidad ComplutenseServicio de Micobacterias (MYC). Centro de Vigilancia Sanitaria Veterinaria (VISAVET). Universidad Complutense (UCM).

MAEVA SERVET, S.L.MAEVA SERVET, S.L..

Universidad ComplutenseDepartamento de Sanidad Animal. Facultad de Veterinaria. Universidad Complutense (UCM).

Junta de Castilla y LeónServicio Territorial de Agricultura y Ganadería. Delegación Territorial de Ávila. Junta de Castilla y León.

Ministerio de Agricultura, Pesca y AlimentaciónSubdirección General de Sanidad e Higiene Animal y Trazabilidad. Dirección General de la Producción Agraria. Ministerio de Agricultura, Pesca y Alimentación (MAPA).







Frontiers in veterinary science
FACTOR YEAR Q
2.245 2019

NLMID: 101666658

ISSN: 2297-1769



TITLE: Evaluation of Risk Factors Associated With Herds With an Increased Duration of Bovine Tuberculosis Breakdowns in Castilla y Leon, Spain


JOURNAL: Front Vet Sci


NUMERACIÓN: 7:545328


AÑO: 2020


PUBLISHER: Lausanne : Frontiers Media S.A


AUTHORS: Pozo P., Romero B., Bezos J., Grau A., Nacar J., Saez JL., Minguez O. and Alvarez J..


VISAVET PARTICIPANTS


2nd
Beatriz Romero Martínez
3rd
Javier Bezos Garrido
Last
Julio Álvarez Sánchez

DOI: https://doi.org/ 10.3389/fvets.2020.545328


CITE THIS PUBLICATION:

Pozo P., Romero B., Bezos J., Grau A., Nacar J., Saez JL., Minguez O. and Alvarez J. Evaluation of Risk Factors Associated With Herds With an Increased Duration of Bovine Tuberculosis Breakdowns in Castilla y Leon, Spain. Frontiers in veterinary science. 7:545328. 2020. (A). ISSN: 2297-1769. DOI: 10.3389/fvets.2020.545328


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