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© Research
Publication : Research in microbiology

Corynebacterium rouxii sp. nov., a novel member of the diphtheriae species complex

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Research in microbiology - 28 Feb 2020

Badell E, Hennart M, Rodrigues C, Passet V, Dazas M, Panunzi L, Bouchez V, Carmi-Leroy A, Toubiana J, Brisse S

Link to Pubmed [PMID] – 32119905

Res. Microbiol. 2020 Feb;

A group of six clinical isolates previously identified as Corynebacterium diphtheriae biovar Belfanti, isolated from human cutaneous or peritoneum infections and from one dog, were characterized by genomic sequencing, biochemical analysis and MALDI-TOF mass spectrometry. The six isolates were negative for the diphtheria toxin gene. Phylogenetic analyses showed that the six isolates (including FRC0190) are clearly demarcated from C. diphtheriae, Corynebacterium belfantii, Corynebacterium ulcerans and Corynebacterium pseudotuberculosis. The average nucleotide identity of FRC0190 with C. diphtheriae NCTC11397 was 92.6%, and was 91.8% with C. belfantii FRC0043. C. diphtheriae subsp. lausannense strain CHUV2995 appeared to be a later heterotypic synonym of C. belfantii (ANI, 99.3%). Phenotyping data revealed an atypical negative or heterogeneous intermediate maltose fermentation reaction for the six isolates. MALDI-TOF mass spectrometry differentiated the new group from the other Corynebacterium taxa by the presence of specific spectral peaks. rpoB sequences showed identity to atypical, maltose-negative C. diphtheriae biovar Belfanti isolates previously described from two cats in the USA. We propose the name Corynebacterium rouxii sp. nov. for the novel group, with FRC0190 (= CIP 111752 = DSM 110354) as type strain.

https://www.ncbi.nlm.nih.gov/pubmed/32119905