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Journal of Clinical Microbiology, January 2000, p. 201-209, Vol. 38, No. 1
Departament de Microbiologia, Hospital de la
Santa Creu i Sant Pau, Universitat Autònoma, 08025 Barcelona,1 and Departament de Medicina,
Unitat de Malalties Infeccioses, Hospital Mutua de Terrassa, 08221 Terrassa,2 Spain, and Minneapolis Veterans
Affairs Medical Center and Department of Medicine,
University of Minnesota, Minneapolis, Minnesota3
Received 27 July 1999/Returned for modification 23 September
1999/Accepted 8 October 1999
To clarify the clinical and bacteriological correlates of
urinary-tract infection (UTI) due to Escherichia coli
O15:K52:H1, during a 1-year surveillance period we prospectively
screened all 1,871 significant E. coli urine isolates at
the Hospital de la Santa Creu i Sant Pau, Barcelona, Spain, for this
serotype and assessed the epidemiological features of
community-acquired UTI due to E. coli O15:K52:H1 versus
other E. coli serotypes. We also compared the 25 O15:K52:H1
UTI isolates from the present study with 22 O15:K52:H1 isolates from
other, diverse geographic locales and with 23 standard control strains
(8 strains from the ECOR reference collection and 15 strains of
nonpathogenic O:K:H serotypes) with respect to multiple phenotypic and
genotypic traits. Although E. coli O15:K52:H1 caused only
1.4% of community-acquired E. coli UTIs during the
surveillance period, these UTIs were more likely to present as
pyelonephritis and to occur in younger hosts, with similar risk
factors, than were UTIs due to other E. coli serotypes.
Irrespective of geographic origin, E. coli O15:K52:H1 strains exhibited a comparatively restricted repertoire of distinctive virulence factor profiles (typically, they were positive for
papG allele II, papA allele F16, and
aer and negative for sfa, afa, hly, and cnf1), biotypes, ribotypes, and
amplotypes, consistent with a common clonal origin. In contrast, their
antimicrobial resistance profiles were more extensive and more diverse
than those of control strains. These findings indicate that E. coli O15:K52:H1 constitutes a broadly distributed and clinically
significant uropathogenic clone with fluid antimicrobial resistance capabilities.
0095-1137/0/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Escherichia coli Serotype O15:K52:H1 as
a Uropathogenic Clone
*
Corresponding author. Mailing address: Departament de
Microbiologia, Hospital de la Santa Creu i Sant Pau, Av. Sant Antoni Ma Claret, 167, 08025 Barcelona, Spain. Phone: 34 93 2919071. Fax: 34 93 2919070. E-mail:
2175{at}hsp.santpau.es.
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