{'fraction_non_alphanumeric': 0.02, 'fraction_numerical': 0.0, 'mean_word_length': 5.740384615384615, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Occurrence of penicillin-resistant and beta-lactamase-producing Bacteroides species in the oral cavity.

Bacteroides species are known to play an important role in orofacial infections. The present investigation shows that penicillin-resistant Bacteroides species are commonly found in the oral cavity and that their occurrence is related to previous penicillin therapy. Several of the penicillin-resistant isolates were also resistant to erythromycin and/or doxycycline while all strains were sensitive to clindamycin and tinidazole. the penicillin resistance was mainly due to beta-lactamase production. A selective cultivation method for detection of penicillin-resistant Bacteroides is described.