TABLE 1.

Reproducibility testing for SIRE and PZA by the M960 system

Drug (μg/ml)	Strainsa	No. of tests performedb	No. of results agreeing with ref- erence methodc	Agreement (%)
INH (0.1)	S	27	27	100
	R	18	18	100
INH (0.4)	S	27	27	100
	R	18	17	94.4
RMB (1.0)	S	27	27	100
	R	18	18	100
EMB (5.0)	S	27	26	94.4
	R	18	18	100
EMB (7.5)	S	27	27	100
	R	18	18	100
SM (1.0)	S	36	35	97.2
	R	9	9	100
SM (4.0)	S	36	36	100
	R	9	9	100
Total		315	312	99
PZA (100)	S	36	36	100
	R	9	8	88.9
Total		45	44	97.8

^aS, susceptible; R, resistant.

^bWith five strains of M. tuberculosis in triplicate from three separate inocula (thus, nine replicates per strain)

^cAgar proportion method for SIRE and B460 system for PZA.