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Evaluation of a direct fluorescent antibody staining method for rapid identification of members of the bacteroides fragilis group


, : Evaluation of a direct fluorescent antibody staining method for rapid identification of members of the bacteroides fragilis group. American Journal of Clinical Pathology 76(1): 78-82

A direct fluorescent antibody test kit (Fluorotec-F, Pfizer Inc., New York, New York) designed for rapid identification of members of the Bacteroides fragilis group (BFG) was evaluated. Tested were 228 clinical specimens (144 direct smears of clinical material, 14 smears of positive blood cultures, and 70 smears of colonies isolated from clinical material) and 49 reference strains of anaerobic bacteria, including 23 members of the BFG. Fluorotec-F detected 68 of 69 (98.5%) members of the BFG, including 55 B. fragilis, 12 B. thetaiotaomicron, and two B. ovatus, identified by cultural methods in all clinical specimens. Three specimens that yielded B. uniformis also fluoresced. Three specimens fluoresced but failed to yield members of the BFG or B. uniformis on culture. Of the 49 reference strains tested, all strains of B. fragilis, B. thetaiotaomicron, nd B. uniformis tested were detected by Fluorotec-F, but only five of a total of 14B. vulgatus, B. distasonis, and B. ovatus tested fluoresced. Of the 25 reference strains of anaerobic bacteria not belonging to the BFG, none fluoresced except for two strains of B. eggerthii. Direct fluorescent antibody staining of smears of clinical specimens suitable for anaerobic culture is a valuable tool for rapid detection of B. fragilis infections.

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Accession: 005395067

PMID: 7020409

DOI: 10.1093/ajcp/76.1.78

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