**4. Mycobacteria genus**

Mycobacteria species are among well-studied genus of microorganism and *M. tuberculosis* has been an exemplar [62, 63]. The ubiquitous nature of organisms in this genus has huge medical implication [64]. Over 100 species have been identified and characterised from soil and water [64]. Mycobacteria could be divided into two main categories namely, tuberculous and non-tuberculous mycobacteria (NTM) or atypical [64]. Tuberculous mycobacteria causes diseases such as pulmonary tuberculous disease and leprosy [63]. Non-tuberculous mycobacterial species include *M. ulcerans, M. avium, M. intracellularae, M. kansasii, M. xenopi, M. chelonae, M. marinum* and *M. fortuitum* [63].
