TABLE 1.

Frequency of mutations associated with PA-824 resistance at 1 and 5 μM

PA-824 concn	No. of colonies/plate for:
	105 CFU plated	106 CFU plated	107 CFU plated
1 µM	3, 2, 2, 1, 0, 0, 0, 0	28, 28, 25, 18, 17, 17, 14, 6	>40a
Frequency	1 × 10−5	1.9 × 10−5
5 µM	None	None	16, 8, 7, 5, 4, 4, 4, 3
Frequency			6.38 × 10−7

^aExact number was not recorded.