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Differences in antibiotic sensitivities between M. abscessus ATCC 19977 and M. smegmatis mc2155 (A to F). Ten-fold serial dilutions of M. abscessus ATCC 19977 and M. smegmatis mc2155 grown to A600 of 0.7 and spotted on Middlebrook 7H10 containing indicated concentrations of antibiotics. M. abscessus is more resistant to amikacin, tetracycline, streptomycin, and spectinomycin than M. smegmatis but the sensitivities to clarithromycin and erythromycin are comparable.
