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Sequential pathology of tick-borne fever
R S Campbell1, A C Rowland, G R Scott
1Department of Biomedical and Tropical Veterinary Sciences, James Cook University, Townsville, Queensland, Australia.
Journal of Comparative Pathology
|October 1, 1994
Summary
This study details mild clinical and pathological responses in sheep infected with Cytoecetes phagocytophila. It describes transient leucopenia and specific histopathological changes, including pulmonary alveolitis and lymphoreticular reactions.
Area of Science:
- Veterinary Pathology
- Infectious Diseases
- Sheep Health
Background:
- Cytoecetes phagocytophila causes mild clinical effects in sheep, as typically observed.
- Understanding the sequential pathology is crucial for diagnosing and managing infections.
Purpose of the Study:
- To describe the sequential pathology and clinical responses in sheep experimentally infected with the Sourhope strain of Cytoecetes phagocytophila.
- To characterize the histopathological changes and identify intracytoplasmic inclusions.
Main Methods:
- Experimental infection of 12 sheep with the Sourhope strain of Cytoecetes phagocytophila.
- Clinical observation and hematological analysis (leucopenia).
- Necropsy and histopathological examination of tissues (lungs, lymph nodes, spleen, CNS) up to 21 days post-infection.
Main Results:
- Mild clinical signs and transient leucopenia (lymphocytes, eosinophils, neutrophils) were observed.
- Parasitaemia occurred between days 5 and 16.
- Histopathological findings included pulmonary alveolitis, lymphoreticular reactions, mesangial glomerulitis, and choroiditis in the CNS.
- Two distinct forms of intracytoplasmic inclusions were identified in lymphoid and macrophagic cells.
Conclusions:
- The study provides a detailed account of mild pathological changes associated with Cytoecetes phagocytophila infection in sheep.
- The findings highlight the importance of considering differential diagnoses in complex infections.
- Characterization of inclusions aids in understanding pathogen-host interactions.