Abstract
ObjectiveTo facilitate large network surveillance, we evaluated use of spoligotyping in combination with different formats (12-, 15- and 24- loci) of to Mycobacterial Interspersed Repetitive Units (MIRU)-Variable Number Tandem Repeats (VNTR) achieve maximal discriminatory power. MethodsSpoligotyping and 24-loci MIRU-VNTR was performed on 127 consecutive extrapulmonary Mycobacterium tuberculosis (M. tuberculosis) isolates. ResultsBased on the analysis of 127 M. tuberculosis isolates, all 3 formats of MIRU-VNTR when coupled with spoligotyping (HGDI: spoligotyping +12-loci, 0.9967<spoligotyping +15-loci, 0.9996 <spoligotyping +24-loci, 1.0000) reported a similar discriminatory power in comparison to MIRU-VNTR alone (HGDI: 12-loci, 0.9951<15-loci, 0.9996<24-loci, 1.0000). ConclusionsThus, we propose the use of spoligotyping as an initial epidemiological typing tool followed by the minimal subset of MIRU-VNTR typing for CAS, Beijing and EAI predominant lineages in the Mumbai population, retaining 100% discriminatory power comparable to that obtained by 24-loci MIRU-VNTR alone. For long-term surveillance, 24-loci MIRU-VNTR would an ideal typing tool for identification of predominant M. tuberculosis lineages in the Mumbai.
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