Pathology of bovine tuberculosis

Area of Science:

• Veterinary Pathology
• Immunology
• Radiology

Background:

• Bovine tuberculosis (bTB) is a chronic granulomatous inflammatory disease primarily affecting cattle lungs and lymph nodes.
• Pathological changes result from host-pathogen interactions, influencing immune responses and inflammation.
• Inhalation is the primary route, leading to respiratory tract lesions and potential generalization.

Purpose of the Study:

• To highlight the importance of assessing TB lesion severity in cattle, particularly for vaccine trials.
• To introduce advanced imaging techniques as objective and quantitative alternatives to traditional scoring systems.
• To emphasize the role of multi-detector computed tomography (MDCT) in measuring lesion volume.

Main Methods:

• Review of pathological findings in bovine and caprine tuberculosis.
• Discussion of traditional semi-quantitative gross lesion scoring systems in cattle.
• Introduction of multi-detector computed tomography (MDCT) for quantitative lesion assessment.

Main Results:

• bTB causes caseous-necrotising inflammation in lungs and lymph nodes.
• Goat TB can present with liquefactive necrosis and caverns, similar to human TB.
• MDCT provides standardized, objective, and quantitative measures of lesion volume, surpassing traditional methods.

Conclusions:

• Accurate assessment of TB lesion severity is critical for evaluating vaccine efficacy in cattle.
• MDCT offers a superior, quantitative approach to lesion assessment compared to subjective scoring systems.
• Quantitative imaging facilitates more standardized and reliable data for bTB research and control strategies.