TABLE 2.

MTD test results on saline suspensions of mycobacteria^a prepared from cultures and diluted 1:100

Isolate	Approx concn (CFU/ml) testedb	MTD test result (RLU)
M. tuberculosis ATCC 25177	6 × 105	3,136,425
M. kansasii ATCC 12478	3 × 106	204,579
M. kansasii from patient 1	1.4 × 107	193,073
M. kansasii from patient 2	6 × 106	187,642
M. kansasii from patient 3	1 × 105	114,861
M. simiae 2170	3 × 106	195,009
M. simiae 1389	3 × 106	117,228
M. avium UH	3 × 106	13,086
M. fortuitum 977	ND	6,652
M. chelonae 1910	ND	13,447
M. szulgai 870	ND	7,508
M. xenopi 729	ND	9,103

^aAt the density of a McFarland opacity standard of 1. 

^bND, not determined.