title: The apparent noninvolvement of the B. fragilis group in early periodontal disease.
mesh_terms: D001441:Bacteroides fragilis; D005888:Gingival Pocket / Q000382:microbiology*; D005891:Gingivitis / Q000382:microbiology*; D006801:Humans; D008297:Male; D010514:Periodontal Pocket / Q000382:microbiology*; D010518:Periodontitis / Q000382:microbiology*