Bacteroides fragilis

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Related to Bacteroides fragilis: Clostridium difficile, clostridium perfringens, E coli

Bac·te·roi·des frag·'i·lis

a bacterial species found in human and animal intestinal tracts. Although it represents only about 10-20% of Bacteroides species found in the colon, it is the primary species associated with intraabdominal abscesses and other subdiaphragmatic infections in humans, including peritonitis, rectal abscess, abdominal surgical wounds, and urogenital tract infection. Its capsule is capable of inducing abscess formation independently; characteristically, this species produces a β-lactamase that inactivates β-lactam antibiotics such as the penicillin and cephalosporin groups; it is the type species of the genus, Bacteroides.

Bacteroides fragilis

A gram-negative anaerobe which is a frequent isolate in anaerobic cultures; it is associated with abscesses, aspiration pneumonia, endocarditis, septic arthritis and empyema.

Bacteroides fragilis

Microbiology A gram-negative anaerobe which is a frequent isolate in anaerobic cultures; it is associated with abscesses, aspiration pneumonia, endocarditis, septic arthritis and empyema

Bac·te·roi·des frag·i·lis

(bak-tēr-oy'dēz fraj'i-lis)
A species that is one of the predominant organisms in the lower intestinal tract of humans and other animals; also found in specimens from appendicitis, peritonitis, rectal abscesses, pilonidal cysts, surgical wounds, and lesions of the urogenital tract. It is the type species of the genus Bacteroides.


a genus of the family Bacteroidaceae, a family of gram-negative, non-spore-forming, obligate anaerobes. Common inhabitants of the alimentary tract and necrotic tissue, probably as secondary invaders.

Bacteroides amylophilus
Bacteroides asaccharolyticus
Bacteroides fragilis
occasionally infects foals, pigs, lambs and calves, causing diarrhea, mastitis and abscesses.
Bacteroides gingivalis
Bacteroides heparinolyticus
Bacteroides levii
see Porphyromonaslevii.
Bacteroides melaninogenicus
see Prevotellamelaninogenica.
Bacteroides nodosus
Bacteroides ruminicola
see Prevotellaruminicola.
Bacteroides salivosus
see Porphyromonassalivosus.
Bacteroides succinogenes
Bacteroides ureolyticus
gram-negative, microaerophilic bacterial species isolated from the genital tract of mares with endometritis.
References in periodicals archive ?
Because of its clinical importance and relative antimicrobial resistance, identification of Bacteroides fragilis is essential.
A new subtype of the metalloprotease toxin gene and the incidence of the three bft subtypes among Bacteroides fragilis isolates in Japan.
Terapia empirica segun patogenos comunes (Goldman, 2011) Condicion Patogenos comunes Agentes predisponente antimicrobianos Absceso dental Streptococus, Penicilina + Bacteroides fragilis Metronidazol Otitis cronica Bacteroides fragilis; Cefotaxina o Pseudomona, Proteus, ceftriaxona + Klebsiella spp.
Isolation, identification and antimicrobial susceptibility of Bacteroides fragilis group strains recovered from broiler faeces.
Species identification was confirmed as Bacteroides fragilis ssp.
The most common pathogen isolated was Escherichia coli, followed by Bacteroides fragilis.
11,13,19) La principal bacteria aerobia encontrada es la Escherichia coli (aproximadamente en el 77% de los casos) y la bacteria anaerobia mas encontrada es Bacteroides fragilis (en el 80% de los casos).
Possible role of enterotoxigenic Bacteroides fragilis in the etiology of infectious vaginitis.
Se identificaron 21 especies de microorganismos distribuidos de la siguiente manera: En la periodontitis localizada: Veillonellaspecies(5), Peptostreptococcus prevotii (4), Staphhylococcus sacchharoliticus (4), Bacteroides fragilis (4), Bacteroides ureolyticus (3).
Experimental infections with Staphylococcus aureus, Streptococcus sanguis, Pseudomonas aeruginosa, and Bacteroides fragilis in the jaws of dogs.