Table 7. Sequence analysis of 10 discrepant rifampin-susceptibility results*.

Sample no.	Rifampin susceptibility
	LiPA result	Phenotypic result	Conclusion after sequencing
1–3	Sensitive	Resistant	From the same patient; wild-type rpoB test region
4	Sensitive	Resistant	Mycobacterium bovis; wild-type rpoB test region
5–7	Resistant (DS4)	Sensitive	From the same patient; synonymous substitution (R528R) not associated with rifampin resistance
8	Resistant (DS1)	Sensitive	2 genotypes present: wild-type (predominant) and mutant (L511P)
9	Resistant (R5)	Sensitive	S531L mutation; wild-type rpoB on retesting, thus likely laboratory error
10	Resistant (DS2)	Sensitive	D516A mutation; no high-level resistance when seen alone

*LiPA, line probe assay.