Azithromycin and erythromycin susceptibility and macrolide resistance genes in Prevotella from patients with periodontal disease.

The MIC values found were high compared to previous studies. erm(F) was greatly prevalent, and we describe for the first time the erm(B) gene in Prevotella spp. The presence of either of the genes seems to be associated with a higher degree of resistance to azithromycin and erythromycin.