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Optical densities (OD) of biofilms formed by a semi-quantitative technique using a violet crystal. The images show the differences in biofilm formation by M. abscessus, M. fortuitum, and M. massiliense at increasing concentrations of sulfamethoxazole Cd (upper images) and sulfamethoxazole Hg (lower images). (*)Statistically significant difference between the positive control and the corresponding concentration.
