Bacillus infantis sp. nov. and Bacillus idriensis sp. nov., isolated from a patient with neonatal sepsis

<jats:p>Two Gram-positive bacilli, designated as strains SMC 4352-1<jats:sup>T</jats:sup> and SMC 4352-2<jats:sup>T</jats:sup>, were isolated sequentially from the blood of a newborn child with sepsis. They could not be identified by using conventional clinical microbiological methods. 16S rRNA gene sequencing and phylogenetic analysis revealed that both strains belonged to the genus <jats:italic>Bacillus</jats:italic> but clearly diverged from known <jats:italic>Bacillus</jats:italic> species. Strain SMC 4352-1<jats:sup>T</jats:sup> and strain SMC 4352-2<jats:sup>T</jats:sup> were found to be closely related to <jats:italic>Bacillus firmus</jats:italic> NCIMB 9366<jats:sup>T</jats:sup> (98.2 % sequence similarity) and <jats:italic>Bacillus cibi</jats:italic> JG-30<jats:sup>T</jats:sup> (97.1 % sequence similarity), respectively. They also displayed low DNA–DNA reassociation values (less than 40 %) with respect to the most closely related <jats:italic>Bacillus</jats:italic> species. On the basis of their polyphasic characteristics, strain SMC 4352-1<jats:sup>T</jats:sup> and strain SMC 4352-2<jats:sup>T</jats:sup> represent two novel species of the genus <jats:italic>Bacillus</jats:italic>, for which the names <jats:italic>Bacillus infantis</jats:italic> sp. nov. (type strain SMC 4352-1<jats:sup>T</jats:sup>=KCCM 90025<jats:sup>T</jats:sup>=JCM 13438<jats:sup>T</jats:sup>) and <jats:italic>Bacillus idriensis</jats:italic> sp. nov. (type strain SMC 4352-2<jats:sup>T</jats:sup>=KCCM 90024<jats:sup>T</jats:sup>=JCM 13437<jats:sup>T</jats:sup>) are proposed.</jats:p>