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© Institut Pasteur
Spirochète : bactérie hélicoïdale, flexible et ondulante de longueur variable, non colorable par la coloration de Gram, très mobile (endoflagelles). Trois familles : Spirochaetaceae, Leptospiraceae, et Brachyspiraceae. Principaux genres pathogènes pour l'homme : Borrelia (Borrelia burgdorferi cause de la maladie de Lyme), Treponema (Treponema pallidum cause de la syphillis), Leptospira (Leptospira interrogans serovar icterohaemorrhagiae cause de la maladie de Weil). Image colorisée.
Publication : Frontiers in microbiology

Biodiversity of Environmental : Improving Identification and Revisiting the Diagnosis

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Frontiers in microbiology - 01 May 2018

Thibeaux R, Girault D, Bierque E, Soupé-Gilbert ME, Rettinger A, Douyère A, Meyer M, Iraola G, Picardeau M, Goarant C

Link to Pubmed [PMID] – 29765361

Front Microbiol 2018;9:816

Leptospirosis is an important environmental disease and a major threat to human health causing at least 1 million clinical infections annually. There has recently been a growing interest in understanding the environmental lifestyle of . However, isolation from complex environmental samples is difficult and time-consuming and few tools are available to identify isolates at the species level. Here, we propose a polyphasic isolation and identification scheme, which might prove useful to recover and identify environmental isolates and select those to be submitted to whole-genome sequencing. Using this approach, we recently described 12 novel species for which we propose names. We also show that MALDI-ToF MS allows rapid and reliable identification and provide an extensive database of MALDI-ToF mass spectra, which will be valuable to researchers in the leptospirosis community for species identification. Lastly, we also re-evaluate some of the current techniques for the molecular diagnosis of leptospirosis taking into account the extensive and recently revealed biodiversity of in the environment. In conclusion, we describe our method for isolating from the environment, confirm the usefulness of mass spectrometry for species identification and propose names for 12 novel species. This also offers the opportunity to refine current molecular diagnostic tools.

https://www.ncbi.nlm.nih.gov/pubmed/29765361