Table 1. . In vitro competitive assays reveal fitness cost of the RpoB H526D mutant.

Strain mixture	7H9 broth (CFU/ml)		Progressive hypoxia (CFU/ml)
	Day 0	Stationary phase (day 10)	Day 0	7 days after color change (day 21)
CDC1551	1.2 × 106	2.5 × 108	7 × 104	1.3 × 105
rpoB mutant	2.2 × 106	9.4 × 107	1.5 × 105	6.5 × 104
Ratio		0.70		-2.4