Get access to all handy features included in the IVIS website
- Get unlimited access to books, proceedings and journals.
- Get access to a global catalogue of meetings, on-site and online courses, webinars and educational videos.
- Bookmark your favorite articles in My Library for future reading.
- Save future meetings and courses in My Calendar and My e-Learning.
- Ask authors questions and read what others have to say.
Detection of Corynebacterium pseudotuberculosis as an etiologic agent causing polyarthritis in lambs
Ruiz, H.; Juní, M.; Pons, M...
Get access to all handy features included in the IVIS website
- Get unlimited access to books, proceedings and journals.
- Get access to a global catalogue of meetings, on-site and online courses, webinars and educational videos.
- Bookmark your favorite articles in My Library for future reading.
- Save future meetings and courses in My Calendar and My e-Learning.
- Ask authors questions and read what others have to say.
Read
Objectives: Polyarthritis is one of the most important pathologies in lambs, both in lactation and during fattening period, due to the implications that this pathology has in the economy of the farm, as it produces growth losses and an increase in mortality. Polyarthritis can be caused by some different microorganisms such as Streptococcus dysgalactiae, Erysipelothrix rhusiopathiae, Trueperella pyogenes, etc.
Corynebacterium pseudotuberculosis is the etiologic agent of the caseous lymphadenitis (CLA) which usually affects small ruminants. The most frequent locations of the pyogranulomas caused by C. pseudotuberculosis are in superficial lymph nodes, in the superficial clinical form of the disease, or in deep lymph nodes such as mediastinic and internal organs, in visceral clinical form.
In this paper is described the first presentation of C. pseudotuberculosis as microorganism responsible for polyarthritis in feedlot lambs.
Materials and methods: The Ruminant Clinical Service (SCRUM) of the Veterinary Faculty of Zaragoza, Spain, receives animals from the Faculty ́s area of influence which can be culling animal belonging to collaborating farms or clinical cases referred by veterinarians. Two fattening lambs coming from two different clinical cases of polyarthritis were referred to the SCRUM during 2019 in order to reach a final diagnosis of the cause of the outbreak.
Both animals were subjected to the same protocol of all the animals received at the service. They were submitted to a rigorous clinical examination and blood samples were taken to carry out a blood count test. Subsequently, thermography and arthrocentesis of the affected joints were made in both animals. In addition, a computed tomography (CT) was also performed in one of the animals. Finally, the lambs were humanely sacrificed to conclude with a complete pathological examination with sampling of affected joints. Samples obtained from arthrocentesis and post-mortem study were quickly submitted to the laboratory in order to perform a microbiological and biomolecular analysis. The isolation of the causative agent was carried out in the laboratory EXOPOL diagnóstico y autovacunas S.L.
Results: The clinical examination of the lambs showed that one of the lambswas affected in the tarsal joint of the right hindlimb and the other in the tarsal joint of the left hindlimb. The animals were lame and reluctant to move and they also showed a clear stunted growth. The affected joints were hot, swollen and painful.
Hematology revealed a clear leukocytosis with neutrophilia in both animals. These parameters can be indicatives of an acute bacterial infection. Likewise, thermography showed an increase in the temperature of the joint of the affected limbs in comparison with the unaffected joints. Finally, computed tomography (CT) scan performed in one of the lambs revealed an important enlargement of the popliteal lymph node of the affected limb that partially collapsed the adjacent vein, which hinders the venous return.
Pathological findings confirmed an important purulent arthritis in the affected joints in both lambs.
In Both analyzed animals a massive and pure isolation of Corynebacterium pseudotuberculosis was obtained in the affected joints, in both samples, those of arthrocentesis and those taken after necropsy.
Conclusions: It can be concluded that Corynebacterium pseudotuberculosis can cause polyarthritis in lambs, therefore, this microorganism should be included in the list of microorganisms associated with this disorder in lambs. However, the reason why C. pseudotuberculosis is able to migrate to the joint and produce this pathology is still unknown.
Keywords: Corynebacterium pseudotuberculosis, polyarthritis, lambs, arthrocentesis.
Get access to all handy features included in the IVIS website
- Get unlimited access to books, proceedings and journals.
- Get access to a global catalogue of meetings, on-site and online courses, webinars and educational videos.
- Bookmark your favorite articles in My Library for future reading.
- Save future meetings and courses in My Calendar and My e-Learning.
- Ask authors questions and read what others have to say.
About
Affiliation of the authors at the time of publication
Facultad Veterinaria de la Universidad de Zaragoza, c/ Miguel Server 177, 50013., Zaragoza, Spain;
Centro de servicios clínicos veterinarios Osca, Avda. del Cinca 55, 22300, Barbastro, Spain;
EXOPOL diagnósticos y autovacuna S.L., Pol. Río Gállego D/8 50840, San Mateo de Gállego, Spain.
Comments (0)
Ask the author
0 comments