Antimicrobial Susceptibilities of Porphyromonas gingivalis, Prevotella intermedia, and Prevotella nigrescens spp. Isolated in Spain

The susceptibilities of 143 Porphyromonas gingivalis, Prevotella intermedia, and Prevotella nigrescens isolates to 18 antimicrobial agents were tested. All P. gingivalis isolates were susceptible. In contrast, some Prevotella spp. (17%) were resistant to β-lactams, erythromycin, clindamycin, or tetracycline and carried resistance genes, ermF or tetQ, or β-lactamases.