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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 : Epidemiology and infection

First isolation of Leptospira noguchii serogroups Panama and Autumnalis from cattle

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Epidemiology and infection - 04 Sep 2014

Martins G, Loureiro AP, Hamond C, Pinna MH, Bremont S, Bourhy P, Lilenbaum W

Link to Pubmed [PMID] – 25185756

Epidemiol. Infect. 2015 May;143(7):1538-41

Prevention and control of leptospirosis are based on the knowledge of locally circulating strains. Thus, efforts to obtain local isolates are paramount to the epidemiological understanding of leptospirosis. We report and discuss here the first isolation of members of serogroups Autumnalis and Panama from cattle, both belonging to Leptospira noguchii species. Urine samples (n = 167) were collected directly by puncture of the bladder from randomly selected cows from a slaughterhouse in Rio de Janeiro, Brazil, for bacteriological culture. Isolates were characterized by serogrouping and sequencing (rrs and secY genes). Overall, 10/167 positive urine samples (6%) were obtained. Sequencing of amplicons targeting for both rrs and secY genes identified two of them (2013_U73 and 2013_U232) as L. noguchii. Serogrouping of those strains indicated that 2013_U73 belonged to the Panama serogroup (titre 1600), and 2013_U232 to the Autumnalis serogroup (titre 12800). Both Panama and Autumnalis are known agents of incidental leptospirosis in cattle. This group of leptospires could be particularly important in tropical countries. This is the first report of members of serogroups Autumnalis and Panama belonging to L. noguchii species from cattle. Although related to previously reported strains, these isolates have been shown to be genetically diverse from them.

http://www.ncbi.nlm.nih.gov/pubmed/25185756