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Mycobacteriosis outbreak caused by Mycobacterium aviumsubsp.avium detected through meat inspection in five porcine fattening farms

Pérez de Val, B.; Grau-Roma, Llorenc; Segalés, J.; Domingo, M.; Vidal, E.

Authors

B. Pérez de Val

Llorenc Grau-Roma

J. Segalés

M. Domingo

E. Vidal

Abstract

Between December 2010 and January 2011 a number (n=20) of cases were submitted to the Slaughterhouse Support Service (Servei de Suport a Escorxadors, SESC-CReSA), consisting of grossly nodular granulomatous and caseous lesions in pig carcasses from five different farms. Lesions involved lymph nodes, lungs, liver and spleen.

Histopathological examination showed multifocal to coalescent, granulomatous and necrotizing splenitis, hepatitis, pneumonia and lymphadenitis. The presence of acid-fast bacilli in some cases revealed that it was a mycobacteriosis.


Bacteriological analysis was performed to confirm the diagnosis and identify the aetiological agent (to rule out it was from the M. tuberculosis complex mycobacteria, which includes species causing human and animal tuberculosis). The identification of culture isolates by PCR confirmed the growth of M. avium complex. Further sequencing analysis determined it was M. avium. subsp. avium.


The most likely source of the outbreak was considered to be the feed which shared the five farms, which might have been contaminated with M. avium subsp. avium (common pathogen in poultry and other birds). The fact that most of the animals presented a clear involvement of abdominal viscera is consistent with an oral route of infection.

Journal Article Type Article
Publication Date Dec 13, 2013
Journal Veterinary Record
Print ISSN 0042-4900
Electronic ISSN 2042-7670
Publisher BMJ Publishing Group
Peer Reviewed Peer Reviewed
Volume 174
Issue 4
Article Number 96
Institution Citation Pérez de Val, B., Grau-Roma, L., Segalés, J., Domingo, M., & Vidal, E. (2013). Mycobacteriosis outbreak caused by Mycobacterium aviumsubsp.avium detected through meat inspection in five porcine fattening farms. Veterinary Record, 174(4), doi:10.1136/vr.101886
DOI https://doi.org/10.1136/vr.101886
Keywords Mycobacteriosis, Tuberculosis, Pigs, Mycobacterium avium, Slaughterhouse
Publisher URL http://dx.doi.org/10.1136/vr.101886
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information © 2013 British Veterinary Association

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