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In a 6-month-old pig casrcass, multiple nodular lesions, compatible with granulomas were observed in the liver, spleen, and gastrohepatic and mesenteric lymph nodes.

 

Spleen with multiple white nodular lesions.

 

Whitish lesions in the lymph nodes.

 

What is your diagnosis? (73)

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The anatomopathological study demonstrated that the nodules were granulomatous lesions compatible with a mycobacteriosis. Mycobacteria culture allowed isolation of Mycobacterium avium hominisuis. Mycobacteria in the M. avium complex in pigs  can give tuberculosis compatible lesions as we have previously shown in an infection by M. avium avium. In any case, if we observe these lesions, it is necessary to submit samples to the laboratory to rule out that it is a mycobacteria from the M. tuberculosis complex, such as M. bovis, M.caprae or M.microti, which cause zoonotic tuberculosis and, in pigs, would cause indistinguishable lesions from those observed in this case. In this blog we have reported such cases in wild boars. Other bacteria, such as Nocardia or Rhodococcus, can also lead to piogranulomatous lesions that must be ruled out.
Your answers are highlighted below.
Question 1
What microbe was cultured from these lesions?
A
Nocardia
B
Mycobacterium avium
C
Mycobacterium caprae
D
Rhodococcus equii
E
Mycobacterium microti
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