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Culturing and Molecular TypingAll specimens were processed according to standard methods.Tuberculous-like animal lesions were dissected and manuallyhomogenized, then decontaminated with 4% NaOH for15 min and centrifuged at 3,000 rpm for 15 min. The sedimentwas neutralized with 2 N HCl using phenol red as anindicator and inoculated on three different media slants: TwoLo¨wenstein–Jensen (LJ) media supplemented either withglycerol or pyruvate, and Middlebrook 7H11 media (Berget al. 2009). The slants were incubated at 37C for 8 weeks andexamined daily for the first week and then weekly for the presence of mycobacterial colonies. Cultures were considerednegative if no visible growth was detected after 8 weeks ofincubation. Microscopic examination of cultures using theZiehl–Neelsen staining method was performed to detect the presence of acid-fast-positive bacilli (AFB) (Roberts et al.1991). AFB-positive cultures were prepared as 20% glycerolstocks and stored at -80C as reference.
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