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Epidemiological investigation of bovine tuberculosis herd breakdowns in Spain 2009/2011

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August 15th, 2014

We analyzed the most likely cause of 687 bovine tuberculosis (bTB) breakdowns detected in Spain between 2009 and 2011 (i.e., 22% of the total number of breakdowns detected during this period). Seven possible causes were considered: i) residual infection; ii) introduction of infected cattle from other herds; iii) sharing of pastures with infected herds; iv) contiguous spread from infected neighbor herds; v) presence of infected goats in the farm; vi) interaction with wildlife reservoirs and vii) contact with an infected human. For each possible cause a decision tree was developed and key questions were included in each of them. Answers to these key questions lead to different events within each decision tree. In order to assess the likelihood of occurrence of the different events a qualitative risk assessment approach was used. For this purpose, an expert opinion workshop was organized and ordinal values, ranging from 0 to 9 (i.e., null to very high likelihood of occurrence) were assigned. The analysis identified residual infection as the most frequent cause of bTB breakdowns (22.3%; 95%CI: 19.4-25.6), followed by interaction with wildlife reservoirs (13.1%; 95%CI: 10.8-15.8). The introduction of infected cattle, sharing of pastures and contiguous spread from infected neighbour herds were also identified as relevant causes. In 41.6% (95%CI: 38.0-45.4) of the breakdowns the origin of infection remained unknown. Veterinary officers conducting bTB breakdown investigations have to state their opinion about the possible cause of each breakdown. Comparison between the results of our analysis and the opinion from veterinary officers revealed a slight concordance. This slight agreement might reflect a lack of harmonized criteria to assess the most likely cause of bTB breakdowns as well as different perceptions about the importance of the possible causes. This is especially relevant in the case of the role of wildlife reservoirs




Guta S., Casal J., Napp S., Saez JL., Garcia-Saenz A., Perez de Val B., Romero B., Alvarez J. and Allepuz A.




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Epidemiological investigation of bovine tuberculosis herd breakdowns in Spain 2009/2011

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Epidemiological investigation of bovine tuberculosis herd breakdowns in Spain 2009/2011


Participants:

National Animal Health Diagnostic and Investigation Center (NAHDIC).

Universitat Autňnoma de BarcelonaCentre de Recerca en Sanitat Animal (CReSA). Universitat Autňnoma de Barcelona (UAB).

Universitat Autňnoma de BarcelonaDepartamento de Sanidad y de Anatomía Animal. Facultad de Veterinaria. Universitat Autňnoma de Barcelona (UAB).

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

University of MinnesotaDepartment of Veterinary Population Medicine. College of Veterinary Medicine. University of Minnesota (UMM).







PLoS ONE
FACTOR YEAR Q
3.234 2014

NLMID: 101285081

PMID: 25127254

ISSN: 1932-6203



TITLE: Epidemiological investigation of bovine tuberculosis herd breakdowns in Spain 2009/2011


JOURNAL: PLoS ONE


NUMERACIÓN: 9(8):e104383


AÑO: 2014


PUBLISHER: Public Library Science


AUTHORS: Guta S., Casal J., Napp S., Saez JL., Garcia-Saenz A., Perez de Val B., Romero B., Alvarez J. and Allepuz A.


VISAVET PARTICIPANTS


7th
Beatriz Romero Martínez
8th
Julio Álvarez Sánchez

DOI: https://doi.org/ 10.1371/journal.pone.0104383


CITE THIS PUBLICATION:

Guta S., Casal J., Napp S., Saez JL., Garcia-Saenz A., Perez de Val B., Romero B., Alvarez J. and Allepuz A. Epidemiological investigation of bovine tuberculosis herd breakdowns in Spain 2009/2011. PLoS ONE. 9(8):e104383. 2014. (A). ISSN: 1932-6203. DOI: 10.1371/journal.pone.0104383


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