No abstract available.
Bacteroides fragilis* ; Bacteroides*

No abstract available.
Bacteroides fragilis* ; Bacteroides*

No Abstract Available.
Bacteroides fragilis* ; Bacteroides* ; Genetic Structures* ; Neuraminidase*

No abstract available.
Bacteroides fragilis* ; Bacteroides* ; Enterotoxins* ; Epithelial Cells* ; Humans* ; Signal Transduction*

The result of the study of using FAB and PYG in isolation and identification of ETBF from fecal samples were as follows: FAB medium had more advantages as compared to PYG. Together with using FAB, the PCR method can differentiate and identity ETBF from the B. fragilis species. The detection limit of PCR was 103 CFU of bacteria per ml of fecal suspension. Among 27 B. fragilis trains, 66% of them were positive with primer pair GBF 201-210 by PCR. The findings showed that ETBF can be detected by culturing samples in FAB together with identification by PCR. More studies could be done for detecting ETBF from fecal samples, especially from diarrhea patients
Bacteroides fragilis ; Polymerase Chain Reaction

No abstract available.
Bacteroides fragilis* ; Bacteroides* ; Enterotoxins* ; Epithelial Cells* ; Gene Expression* ; Humans* ; Intestinal Mucosa*

Enterotoxigenic B. pagilis (ETBF) strains which produce a 20 kDa zinc metalloprotease toxin (BFI) have been associated with diarrheal disease of animals and young children. Using B. pngilis toxin gene (bfi) from strain 86-5443-2-2 (piglet isolate) as a probe, the gene was identified in 74/77 human and animal ETBF strains but only 2/97 non-toxigenic B. fragilis (NTBF) strains. The region flanking bp was mapped with several restriction enzymes and 8 resriction fragments aacent to bft were used to probe colony blots of 77 KTBF and 97 NTBF strains. All 74 bft-positive ETBF strains hybridized to the 8 probes spanning a ca. 18 kb chromosomal region; however, this 18 kb region was absent in the 3 ETBF strains lacking p, and 47 of the 97 (48%) NTBF strains lacked the entire 18 kb region. Of note, the 2 NTBF strains containing btf did not have a ca. 12 kb region upstream of btfp. A ca. 9 kb fragment flanking the btf gene has been sequenced. Analysis of this data revealed several open reading frames (ORF) of which 3 are of particular interest (ORFs 1, 2 and 3). ORF1 and ORF3 encode proteins with significant homology to mobilization proteins, and ORF2 encodes a protein with significant homology to metalloprotease proteins, but only 50% similarity and 30% identity to BFf. These results suggest: 1) the btf genes are flanked by at least 18 kb of DNA largely unique to ETBF strains indicating a putative pathogenic island, 2) another metalloprotease protein present in ETBF strains may contribute to the pathogenicity and variable virulence of these diarrheagenic strains and 3) the pathogenic island may be mobiTized among different Bacteroides strains, and possibly among different species of intestinal bacteria.
Animals ; Bacteria ; Bacteroides fragilis* ; Bacteroides* ; Child ; DNA ; Genomic Islands* ; Humans ; Open Reading Frames ; Virulence* ; Zinc

The susceptibilities of 45 clinical isolates of bacteroidis fragilis to cefaclor, ciproflxacin and imipenem were determined by new method, E-test (AB Bidisk, Solna, Sweden) and were compared with those from conventional agar dilution method by using brain heart infusion, Mueller-Hinton and Wilk:..s Chalgren agar plates. And the susceptibility of 60 clinical isolates of bacteroides fragilis group (B. fragilis 45 strains, B. distasonis 6 strains, B. ovatus 5 strains, B. thetaiotaomicron 4 strains) to 5 quinolones (ciprofloxacin, enoxacin, norfloxacin, ofloxacin, pefloxacin) were determined by in vitro agar dilution method. Compared with agar dilution MICs for B. fragilis 45 strains, 90.3% of E-test MICs were within +/- 1 dilution of the agar dilutions, and 98.4% were within 2 dilutions. And there were little effect of different medium bases to determine MICs except Mueller-Hinton agar. On Mueller-Hinton agar, B. fragilis showed have or no growth activity. In vitro susceptibility of B. fragilis group to quinolones, most of the test strains showed resistant patterns to quinolones except ofloxacin and there was little difference of susceptibility patterns between species of B. fragilis group.
Agar* ; Bacteroides fragilis* ; Bacteroides* ; Brain ; Cefaclor ; Enoxacin ; Heart ; Imipenem ; Norfloxacin ; Ofloxacin ; Quinolones

In this study, we report three cases in which two species of the Bacteroides fragilis group, 'Bacteroides nordii' and 'Bacteroides salyersiae', were isolated from peritoneal fluid cultures from post-operative peritonitis patients. The two species of the B. fragilis group were initially misidentified as B. fragilis/Bacteroides stercoris and Bacteroides ovatus by Rapid ID 32A (bioMérieux, France), and finally confirmed as B. nordii and B. salyersiae using matrix-assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF MS) and 16s rRNA sequencing. For the identification of anaerobes, particularly B. fragilis group organisms, MALDI-TOF MS is a useful method not only because of its concordance with 16S rRNA sequencing results, but also because of its rapidity and simple procedure.
Ascitic Fluid ; Bacteroides fragilis ; Bacteroides* ; Humans ; Mass Spectrometry ; Peritonitis* ; Spectrum Analysis

No Abstract Available.
Bacteroides fragilis* ; Bacteroides* ; Chemokines, CXC* ; Enterotoxins* ; Epithelial Cells* ; Humans* ; NF-kappa B*