Fig. 2.

Phylogenetic tree showing the relationships of the anaerobic Gram-negative rods isolated from the three patients in this study and closely related species. The tree was inferred from 16S rRNA data by the neighbor-joining method and rooted using the 16S rRNA gene sequence of Bacteroides ureolyticus (GenBank accession no. FN401327.1). Bootstrap values were calculated from 1,000 trees. The scale bar indicates the estimated number of substitutions per 100 bases. Names and accession numbers are given as cited in the GenBank database.