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B. fragilis

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Species determination of 277 Bacteroides isolates with commercial<br />

identification kits and by MALDI Biotyper<br />

Species Number of isolates<br />

with an identification score with discrepant species selected for 16S rDNA<br />

>2.0 by MALDI-TOF MS identification by biochemical tests sequencing*<br />

Bacteroides <strong>fragilis</strong> 179 5 2<br />

Bacteroides thetaiotaomicron 43 5 4<br />

Bacteroides ovatus 15 6 1<br />

Bacteroides vulgatus<br />

Bacteroides uniformis<br />

20<br />

5 97.5%<br />

1<br />

3 8.3%<br />

1<br />

2<br />

Bacteroides eggerthii 1 0<br />

Bacteroides nordii 4 3 1<br />

Bacteroides salyersiae 1 0<br />

Bacteroides massiliensis 2 0<br />

Inconclusive identification by<br />

MALDI-TOF MS 7 7<br />

*Only strains with a log(score) 2.0-2.5 were selected for sequencing<br />

Nagy et al. CMI 15: 796-802 2009<br />

19

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