Susceptibility of actinobacillus actinomycetemcomitans strains to norfloxacin / Suscetibilidade de linhagens de actnobacillus actinomycetemcomitans ao norfloxacino

The minimal inhibitory concentration of norfloxacin to Actinobacillus actinomycetemcomitans strains isolated from patients with localized juvenile periodontitis was determined by using an agar dilution method. All the tested strains, including the three reference strains, were susceptible at concentrations lower than the breakpoint used, with 90 percent of the strains susceptible to 0.125 µg/ml