We investigated the antimicrobial activity of ampicillin, panipenem, and ofloxacin against oral Streptococci, which were isolated from odontogenic infections, adherent to solid phase. The minimum inhibitory concentration (MIC
AD) and minimum bactericidal concentration (MBC
AD) for 10 oral Streptococci (
S. mitis, 2 strains ;
S. sanguis, 5;
S. salivarius, 1;
S. mutans, 1;
S. oxalis, 1) that were adhered to the bottom of multi-well plastic tissue culture plates, were determined. The results were as follows: MIC
AD, 0.025*12.5li g/mL, and MBC
AD, 200->400μg/mL, for ampicillin; MIC
AD, <0.025-0.025μg/mL, and MBC
AD, 12.5 -> 400μg/mL, for panipenem; and MICAD, <0.025-1.56μg/mL, and MBC
AD, 50-> 400μg/mL, for ofloxacin. From the results above, it is clear that oral Streptococci can show a much higher MBC
ADthan MIC
ADwhen adhering to solid phase, although there are some differences according to the antibiotics and strains studied.
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