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European Journal of Clinical Microbiology & Infectious Diseases

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01-09-2010 | Article

Identity, virulence genes, and clonal relatedness of Aeromonas isolates from patients with diarrhea and drinking water

Authors: M. Pablos, M.-A. Remacha, J.-M. Rodríguez-Calleja, J. A. Santos, A. Otero, M.-L. García-López

Published in: European Journal of Clinical Microbiology & Infectious Diseases | Issue 9/2010

Abstract

Among 800 stool specimens from patients with diarrhea submitted by Primary Care Centers for routine analysis to the Hospital of León (NW Spain) Microbiology and Parasitology Service, 32 (4%) were tested positive for Aeromonas spp. Mixed infections with other enteric pathogens occurred in 12 patients. A. caviae was isolated from 23 clinical specimens. There were also patients infected with A. media, A. hydrophila, A. bestiarum, and A. veronii biovar veronii. All but three isolates carried one or more of the virulence genes. The incidence of the alt, hlyA, aerA, ast, and laf genes was 71.9, 28.1, 25.0, 18.8, and 9.4%, respectively. The alt ⁺/ast ⁺ combination was detected in four isolates and the aerA⁺/hlyA⁺ combination was detected in the two A. hydrophila isolates. None of the strains harbored the TTSS, stx1, or stx2 genes and nine bore plasmids. Thirty clinical isolates and a collection of 12 A. caviae and A. media strains obtained from León municipal drinking water over the study period were typed by pulsed-field gel electrophoresis (PFGE). PFGE patterns revealed genetic relatedness and persistence over time among water isolates and some clinical isolates. Interestingly, one A. caviae (aerA⁻/hlyA⁻/alt ⁺/ast ⁻/laf ⁺) human isolate and two A. caviae (aerA⁻/hlyA⁻/alt ⁺/ast ⁻/laf ⁺) drinking water isolates had indistinguishable PFGE patterns, suggesting waterborne infection.

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Title: Identity, virulence genes, and clonal relatedness of Aeromonas isolates from patients with diarrhea and drinking water
Authors: M. Pablos
M.-A. Remacha
J.-M. Rodríguez-Calleja
J. A. Santos
A. Otero
M.-L. García-López
Publication date: 01-09-2010
Publisher: Springer-Verlag
Published in: European Journal of Clinical Microbiology & Infectious Diseases / Issue 9/2010
Print ISSN: 0934-9723
Electronic ISSN: 1435-4373
DOI: https://doi.org/10.1007/s10096-010-0982-3

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