Description of three new Leptotrichia species isolated from dental biofilm: Leptotrichia rugosa sp. nov., Leptotrichia mesophila sp. nov. and Leptotrichia alba sp. nov.

Three bacterial strains, namely HSP-334, HSP-342 and HSP-536, were isolated from human oral dental biofilm. These strains were identified as Gram-stain-negative, straight or slightly curved anaerobes. Based on 16S rRNA genes analysis, strain HSP-334 exhibited the closest identity to Leptotrichia shahii LB37 (92.