Table 2.

Frequencies of M. tuberculosis phenotypic resistance to biapenem and rifampicin

Drug(s) (concentration in mg/L)	Frequency of phenotypic resistance of each of the following strains of M. tuberculosis
	H37Rv	115R	124R
Rifampicin (10)	2.8 × 10−8	2.5 × 10−5	NA
Biapenem (80)	1.0 × 10−4	1.0 × 10−5	1.5 × 10−4
Rifampicin (10)+ biapenem (80)	<5 × 10−9	<5 × 10−9	8.0 × 10−5

Plates were inoculated with 2 × 10⁸ cfu. NA, not applicable.