Strain diversity and relative transmission of Mycobacterium tuberculosis in south coastal Karnataka, India

K. Chawla, A. Kumar, V. P. Shenoy, D. S. Chauhan, P. Sharma

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2 Citations (Scopus)


B A C K G R O U N D: There are no published reports on the strain diversity and relative transmission of Mycobacterium tuberculosis isolates circulating in Karnataka State, India. O B J E C T I V E: To explore the strain diversity of M. tuberculosis isolates and their relative transmission in south coastal Karnataka using spoligotyping and mycobacterial interspersed repetitive unit-variable number of tandem repeats (MIRU-VNTR) typing. D E S I G N: A total of 108 clinical isolates of M. tuberculosis were processed for spoligotyping, and 12-locus MIRU-VNTR typing and cluster analysis was performed. R E S U LT S: Spoligotyping data of 108 isolates revealed 63 spoligotype patterns: 36 (80 isolates, 74.1%) patterns corresponded to spoligotype international types (SITs), whereas 27 (28 isolates, 25.9%) patterns were orphans. A further 57 (52.8%) isolates were clustered into 12 clusters; 51 (47.2%) isolates were unique. The largest spoligotype cluster comprised SIT 48 (L1.2.2), followed by SIT 1942 (L3) and SIT 11 (L1.1.2). Combined MIRU-VNTR typing and spoligotyping analysis further differentiated these 108 isolates into five clusters of two isolates each and 98 individual patterns. C O N C L U S I O N S: Combined use of spoligotyping and MIRU-VNTR typing is best suited for genotyping studies in this region. Very high genetic diversity was observed among the clinical isolates. Further elaborate studies are required for a better understanding of the genetic diversity and transmission dynamics of the strains circulating in this region.

Original languageEnglish
Pages (from-to)878-883
Number of pages6
JournalInternational Journal of Tuberculosis and Lung Disease
Issue number8
Publication statusPublished - 01-08-2018

All Science Journal Classification (ASJC) codes

  • Pulmonary and Respiratory Medicine
  • Infectious Diseases


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