Fluoretec, a commercial kit for the rapid diagnosis by immunofluorescence of infections caused by Bacteroides spp was compared with a standard culture method. A total of 1010 specimens were tested for the presence of B fragilis group by Fluoretec F and B melaninogenicus-oralis and asaccharolytic groups by Fluoretec M. Fluoretec F was positive in 123/152 specimens culturing B fragilis group strains. Seventeen specimens were positive by Fluoretec F but negative on culture. Fluoretec M was positive in 21 of 22 specimens from which B melaninogenicus was cultured. The Fluoretec system was convenient in use, results being obtained within one hour of receipt of the specimen.
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