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Histopathological and microbiological study of porcine lymphadenitis: contributions to diagnosis and control of the disease

Investigation article published in Porcine Health Management

December 4th, 2020

Tuberculosis like lesions (TBL) in free-range pigs are characterised by presenting a marked heterogeneity in pathology and microbiology features, with a notorious role of Mycobacterium tuberculosis complex (MTC), Trueperella pyogenes and different Streptococcus species. However, the capacity of these microorganism to spread to different organic cavities leading to a generalised disease is unknown. Therefore, this study evaluated the organic distribution of these agents in free-range pig carcasses whole condemned due to generalised TBL.A total of 37 totally condemned animals were analysed, and samples of lymph nodes and organs were obtained (n = 262) and subjected to histopathological and microbiological examination. In addition, T. pyogenes and streptococci species were further characterised by PFGE analysis. Two different patterns were evidenced with lack or occasional lesions in superficial inguinal (SILN) and popliteal (PLN) lymph nodes and advanced lesions in submandibular (SLN) (35/36) and gastrohepatic (GHLN) (33/35) lymph nodes (stages III and IV). Early stage granulomas (stage I and II) prevailed in lungs (16/20), liver (14/31) and spleen (7/18). The microbiological analysis revealed that MTC, detected by qPCR, was present in 31 out of 37 animals and 90 (90/262) samples. In 26 out of the 31 pigs, MTC was detected from two or more organs. SLN (24/31) and GHLN (19/31) were the MTC+ organs most frequently detected, with 29 out of 31 MTC+ pigs detected as positive in one or both samples, which points out that both lymph nodes must be included in the sampling of surveillance programs. Other pathogens, such as T. pyogenes and Streptococcus spp., were also involved in generalised lymphadenitis, being frequently isolated from SLN and other organs, such as liver (T. pyogenes), tonsils or lung (Streptococcus spp.). A wide genetic diversity among streptococci was observed, showing the ubiquitous character of these pathogens, however, the isolation of a single clone of T. pyogenes from different organic locations from animals with generalised TBL was a common finding of this study, highlighting that the role of this pathogen in porcine lymphadenitis may be underestimated. These results should be considered in future studies on the pathogenesis and control of porcine lymphadenitis




Cardoso-Toset F., Gomez-Laguna J., Gomez-Gascon L., Rodriguez-Gomez IM., Galan-Relaño A., Carrasco L., Tarradas C., Vela AI. and Luque I.




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Histopathological and microbiological study of porcine lymphadenitis: contributions to diagnosis and control of the disease

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Histopathological and microbiological study of porcine lymphadenitis: contributions to diagnosis and control of the disease



Participants:

Centro de Investigación y Calidad AgroalimentariaCentro de Investigación y Calidad Agroalimentaria (CICAP).

Universidad de CórdobaDepartamento de Anatomía y Anatomía Patológica Comparadas. Facultad de Veterinaria. Universidad de Córdoba (UCO).

Universidad de CórdobaDepartamento de Sanidad Animal. Facultad de Veterinaria. Universidad de Córdoba (UCO).

Universidad ComplutenseServicio de Identificación y Caracterización Microbiana (ICM). Centro de Vigilancia Sanitaria Veterinaria (VISAVET). Universidad Complutense (UCM).

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







FACTOR YEAR Q
3.048 2020

PMID: 33292778

ISSN: 2055-5660



TITLE: Histopathological and microbiological study of porcine lymphadenitis: contributions to diagnosis and control of the disease


JOURNAL: Porcine Health Management


NUMERACIÓN: 6(1):36


AÑO: 2020


PUBLISHER: Springer Nature


AUTHORS: Cardoso-Toset F., Gomez-Laguna J., Gomez-Gascon L., Rodriguez-Gomez IM., Galan-Relaño A., Carrasco L., Tarradas C., Vela AI. and Luque I.


VISAVET PARTICIPANTS


Ana Isabel Vela Alonso

DOI: https://doi.org/10.1186/s40813-020-00172-0


CITE THIS PUBLICATION:

Cardoso-Toset F., Gomez-Laguna J., Gomez-Gascon L., Rodriguez-Gomez IM., Galan-Relaño A., Carrasco L., Tarradas C., Vela AI. and Luque I. Histopathological and microbiological study of porcine lymphadenitis: contributions to diagnosis and control of the disease. Porcine Health Management. 6(1):36. 2020. (A). ISSN: 2055-5660. DOI: 10.1186/s40813-020-00172-0


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