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Two PCR typing methods, based on polymorphism of the insertion sequence IS6110, were compared with Mycobacterium tuberculosis strains by using a single primer complementary to the inverted repeats of IS6110. Total M. tuberculosis DNA either was amplified directly (IS6110-PCR) or was amplified following digestion and ligation (IS6110-inverse-PCR). Both PCR techniques showed a similar degree of discrimination. Because of its simplicity, IS6110-PCR was chosen to confirm that a single M. tuberculosis strain was responsible for an outbreak of tuberculosis in a secondary school. IS6110-PCR was used to study the degree of differentiation in 85 clinical M. tuberculosis isolates from BACTEC 12B broth cultures. Results were consistent with those of the standardized IS6110 restriction fragment length polymorphism (RFLP) analysis method, showing identical PCR types for identical RFLPs, although the degree of discrimination was greater by RFLP analysis. The study concludes that due to its simplicity, IS6110-PCR is a good screening method when quick differentiation between M. tuberculosis strains is needed because BACTEC cultures may be used directly.

Use of a PCR method based on IS6110 polymorphism for typing Mycobacterium tuberculosis strains from BACTEC cultures