Pathogenic scotochromogens (Group II),
M. scrofulaceum and
M. xenopei, and pathogenic nonphotochromogens (Group III),
M. avium and
M. intracellulare, were resistant to ethambutol, whereas nonpathogenic scotochromogens, tap water scotochromogens and
M. fiavescens and nonpathogenic nonphotochromogens,
M. nonchromogenicum, M. terrae, M. triviale, M. novum and
M. gastri, were susceptible to ethambutol.
The susceptibility to ethambutol was determined by a simple method such as inoculating one loopful of the test organism to the Ogawa's egg medium containing 5 μg/m
l ethambutol and comparing the growth on the ethambutol medium with growth on the control medium (Ogawa's egg medium containing no agent). By comparison with the growth on the control medium, no growth or, if any, scant growth (much less than the growth on the control medium)on the ethambutol medium was read as “negative growth” after incubation at 37°C for 2 weeks.
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