117. Mycobacterium diseases of pigs (Zoon.).

Question 1

Mycobacterium Bovis PO infection?

Answer 1

MYCOBACTERIUM BOVIS ʹ PO infection

• Can get infected by ingestion of dairy products, or by grazing on same pasture as cattle
• Lymph nodes on head and neck, can become generalized and reach liver, lungs and bones.
• Lymph nodes can become broken and become a fistula, and contents can be released
• Clinical signs
• Emaciation, fluctuating temperature, lethargy, lung/liver lesions
• TB involvement of joints is more common
• Intradermal skin test ʹ near the ear, reading after 36-48 hours
• Positive ʹ erythema, edema, serum and necrosis

Question 2

M. Avium and atypical mycobacteria?

Answer 2

M. AVIUM & ATYPICAL MYCOBACTERIA

• M. avium subsp. Avium
• generalized, productive lesions,
• Facultative pathogenic mycobacteria
• Infection via birds, environment
• per os (airborne, wound)
• Lymphadenitis, sometimes generalization
• Predisposing factors:
• saw dust, swine dysentery, parasites
• Slaughter house

Question 3

M.tuberculosis?

Answer 3

M. TUBERCULOSIS

• Main agent of human tuberculosis,
• Pigs are susceptible, source of infection is usually via human contact
• Pigs and dogs are capable of shedding M. tuberculosis (cattle not able to shed)
• Infection via pigs wash (swill) without heat treatment
• Primary complex in the gut & mesenterial lymph nodes, local lesions Æ generalization
• Culling
• due to zoonosis