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Myocarditis associated with Theileria spp. in calves
J Hervás1, L Carrasco, J C Gómez-Villamandos
1Departamento de Anatomía y Anatomía Patológica Comparadas, Facultad de Veterinaria, Cordoba, Spain.
Summary
Sudden death in young calves was linked to a severe parasitic myocarditis. Microscopic findings revealed lymphoid proliferation and inflammation, suggesting breed susceptibility contributed to the fatal infection.
Area of Science:
- Veterinary Pathology
- Parasitology
- Animal Infectious Diseases
Background:
- Sudden death in young livestock can stem from various infectious agents.
- Limousin x Retinta calves in Spain are susceptible to specific pathogens.
- Understanding pathological mechanisms is crucial for disease prevention.
Purpose of the Study:
- To investigate the cause of sudden death in two calves.
- To characterize the pathological findings associated with the observed mortality.
- To identify potential contributing factors to disease severity.
Main Methods:
- Necropsy and gross examination of deceased calves.
- Histopathological analysis of spleen, lymph nodes, and myocardium.
- Microscopic identification of parasitic forms and inflammatory responses.
Main Results:
- Intense lymphoid proliferation with prominent germinal centers and hemorrhage in lymphoid tissues.
- Severe myocarditis with inflammatory cell infiltration and myocyte damage.
- Presence of parasitic forms resembling Koch's bodies in lymphoid cells and macrophages.
Conclusions:
- The findings indicate a severe parasitic myocarditis as the cause of sudden death.
- Endothelial damage and thrombosis likely contributed to myocardial injury.
- Young age and non-native breed (Limousin x Retinta) may increase susceptibility to parasitic infection.