title: Enterotoxigenic and non-enterotoxigenic Bacteroides fragilis from fecal microbiota of children.
abstract: Enterotoxigenic Bacteroides fragilis (ETBF) is an important part of the human and animal intestinal microbiota and is commonly associated with diarrhea. ETBF strains produce an enterotoxin encoded by the bft gene located in the B. fragilis pathogenicity island (BfPAI). Non-enterotoxigenic B. fragilis (NTBF) strains lack the BfPAI and usually show two different genetic patterns, II and III, based on the absence or presence of a BfPAI-flanking region, respectively. The incidence of ETBF and NTBF strains in fecal samples isolated from children without acute diarrhea or any other intestinal disorders was determined. All 84 fecal samples evaluated were B. fragilis-positive by PCR, four of them harbored the bft gene, 27 contained the NTBF pattern III DNA sequence, and 52 were considered to be NTBF pattern II samples. One sample was positive for both ETBF and NTBF pattern III DNA sequences. All 19 B. fragilis strains isolated by the culture method were bft-negative, 9 belonged to pattern III and 10 to pattern II. We present an updated overview of the ETBF and NTBF incidence in the fecal microbiota of children from Sao Paulo City, Brazil.
authors.affiliation: Departamento de Microbiologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo, SP, Brazil.
authors.forename: Aline
authors.initials: A
authors.lastname: Ignacio
authors.affiliation: Departamento de Microbiologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo, SP, Brazil.
authors.forename: Miriam Rodriguez
authors.initials: MR
authors.lastname: Fernandes
authors.affiliation: Departamento de Microbiologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo, SP, Brazil.
authors.forename: Mario Julio
authors.initials: MJ
authors.lastname: Avila-Campos
authors.affiliation: Departamento de Microbiologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo, SP, Brazil.
authors.forename: Viviane
authors.initials: V
authors.lastname: Nakano
mesh_terms: D000818:Animals; D001427:Bacterial Toxins / Q000235:genetics*; D001442:Bacteroides Infections / Q000453:epidemiology / Q000382:microbiology*; D001441:Bacteroides fragilis / Q000145:classification / Q000235:genetics* / Q000302:isolation & purification*; D001938:Brazil / Q000453:epidemiology; D002648:Child; D002675:Child, Preschool; D004269:DNA, Bacterial / Q000235:genetics; D005243:Feces / Q000382:microbiology*; D005260:Female; D005838:Genotype; D006801:Humans; D015994:Incidence; D008297:Male; D008666:Metalloendopeptidases / Q000235:genetics*; D058889:Molecular Typing; D016133:Polymerase Chain Reaction
chemical_list: D001427:Bacterial Toxins; D004269:DNA, Bacterial; C405031:Bacteroides fragilis toxin; D008666:Metalloendopeptidases