Neighbor-joining phylogenetic tree of nontuberculous mycobacteria (NTM) isolates based on the alignment of partial nucleotide sequence (430-base pair) of hsp65 gene sequenced using primers described by Telenti et al. (1993). The isolates of NTM identified in this study are preceded with the letters wg, and the source is indicated with the obtained accession numbers in parentheses. The reference NTM strains downloaded from the National Center for Biotechnology Information are in italics, with their respective accession numbers in parentheses. Horizontal distances indicate genetic distance, and the scale bar represents nucleotide substitution per site.