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Summary
Ziehl-Neelsen stained smear, mycobacterial culture and histopathological
examination were used to investigate bovine tuberculosis in tuberculosis suspect lesions
collected from Omdurman and Wau slaughterhouse. A total of 194 (7.92%) out of 2450
animals examined, displayed granulomatous lesions. One hundred and fifty two
(78.35%), specimens were collected from Omdurman Central abattoir, Khartoum State,
and the rest, 42 (21.65%), from wau, Bahr El-Ghazal State. Ninty (46.36%) out of 194
smears prepared from granulomatous lesions revealed presence 0f acid-fast bacteria.
Twenty (22.22%) out of 90 showed branching filaments organisms identified as
Mycobacterium farcinogenes (M. farcinogenes) the remaining 70 (77.78 %) were bacilli
and tentatively identified as M. bovis. Of the 174 specimens, that showed no branching
filaments, only 20 (11.49%), showed visible growth when plated out onto Lowenstein-
Jensen medium (LJ) and incubated aerobically at 37ºC for 4-8 weeks.
Histopathologically the 42 specimens from Wau showed chronic granulomatous
inflammation. In conclusion, microscopical, bacteriological and Histopathological
examinations, are useful techniques in detecting mycobacteria in suspected specimens.
Confirmatory molecular biology techniques such as PCR are highly
recommended to augment the conventional techniques for thorough identification and
characterization of the isolated mycobacteria.
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