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Antimicrobial Susceptibilities of Peptostreptococcus anaerobius and the Newly Described Peptostreptococcus stomatis Isolated from Various Human Sources

Anaerobe Reference Laboratory, Department of Bacterial and Inflammatory Diseases, National Public Health Institute, Helsinki,¹ Kymenlaakso Hospital District, Kotka, Finland²

Received 15 January 2007/ Returned for modification 1 February 2007/ Accepted 21 March 2007

Peptostreptococcus anaerobius sensu lato, currently including two closely related species, P. anaerobius and P. stomatis, is known to be more resistant than other gram-positive anaerobic cocci. We reidentified potential Peptostreptococcus isolates and tested their susceptibilities to eight antimicrobials. Notably, P. anaerobius had constantly higher values for the MIC at which 50% of the isolates are inhibited (MIC₅₀) and the MIC₉₀ than P. stomatis.

Published ahead of print on 2 April 2007.