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Volume 11, Number 1—January 2005

Dispatch

Distribution and Characteristics of Escherichia coli Clonal Group A1

James R. Johnson*†Comments to Author , Andrew C. Murray*†, Michael A. Kuskowski*†, Sören Schubert‡, Marie-Francoise Prère§, Bertrand Picard¶, Raul Colodner#, Raul Raz#**, and TIARAInvestigators
Author affiliations: *VA Medical Center, Minneapolis, Minnesota, USA; †University of Minnesota, Minneapolis, Minnesota, USA; ‡Max von Pettenkofer-Institut für Hygiene und Medizinische Mikrobiologie, München, Germany; §Centre Hospitalier Universitaire Purpan, Toulouse, France; ¶Hôpital Morvan, Brest, France; #HaEmek Medical Center, Afula, Israel; **Technion School of Medicine, Afula, Israel

Main Article

Table 2

Prevalence of phylogenetic groups and Escherichia coli clonal group A (CGA) according to locale and resistance phenotype

E. coli group† Prevalence of indicated E. coli group by locale and TMP-SMZ* phenotype, no. (column %)
Total (N = 1,102)
United States (N = 512)
Non–United States (N = 590)
Overall Susceptible (n = 516) Resistant (n = 586) p value‡ Overall Susceptible
(n = 250) Resistant (n = 262) p
value‡ Overall Susceptible (n = 266) Resistant (n = 324) p value‡
ECOR A 168 (15) 65 (13) 103 (18) 0.02 63 (12) 28 (11) 35 (13) NS 105 (18) 37 (14) 68 (21) 0.03
ECOR B1 143 (13) 70 (14) 73 (12) NS 59 (12) 27 (11) 32 (12) NS 84 (14) 43 (16) 41 (13) NS
ECOR B2 483 (44)§ 277 (54)§ 210 (35) <0.001 213 (42) 134 (54)§ 79 (30)§ <0.001 270 (46) 143 (54)§ 127 (39)§ <0.001
ECOR D 298 (27)§ 98 (19)§ 200 (34) <0.001 176 (34) 60 (24)§ ¶ 116 (44)§# <0.001 122 (21) 38 (14)§ ¶ 84 (26)§# 0.001
CGA 68 (6) 9 (1.7) 59 (10) <0.001 48 (9) 5 (2) 43 (16) <0.001 20 (3.4) 4 (1.5) 16 (5) 0.02

*ECOR, E. coli reference
†TMP-SMZ, trimethoprim-sulfamethoxazole.
‡p values (by Fisher exact test) for comparison of susceptible and resistant isolates are shown when <0.05. NS, not significant.
§For prevalence of group B2 (versus group D) within same column; p ≤ 0.01, McNemar’s test.
¶For prevalence of group D among U.S. (vs. non-U.S.) susceptible isolates; p = 0.005 (Fisher exact test).
#For prevalence of group D among U.S. (vs. non-U.S.) resistant isolates; p < 0.001 (Fisher exact test).

Main Article

1Presented at the American Society for Microbiology 103rd General Meeting, May 18–22, 2003, Washington, D.C.

2The TIARA investigators include the following: Sacared Bodison (University of Maryland, College Park, MD), Franklin R. Cockerill, III (Mayo Clinic and Mayo Medical School, Rochester, MN), Clovis Arns da Cunha (Curitiba-PR, Brazil), Peter Echeverria and Sriluck Simasathien (Armed Forces Research Institute of Medical Sciences and Phramonkutkho Army Hospital, Bangkok, Thailand), Wim Gaastra (University of Utrecht, Utrecht, The Netherlands), Lucinda M.C. Hall (St Bartholomew's and the Royal London School of Medicine and Dentistry, London, UK), Marina Klein (McGill University Health Centre, Montreal, Quebec, Canada), Hank A. Lockman (Battelle Memorial Institute, Columbus, OH), Imad Omer and Jane R. Schwebke (University of Alabama, Birmingham, AL), Guillem Prats (Hospital Vall d'Hebron, Barcelona, Spain), Robert M. Rakita (Virginia Mason Medical Center, Seattle, WA), Susan Rossman (Texas Childrens Hospital, Houston, TX), Ronald Schiffman (Southern Arizona VA Medical Center, Tucson, AZ), Ronald Smith (Billings Clinic and Providence Medical Center, Billings, MT), and Patricia L. Winokur (VA Medical Center and University of Iowa, Iowa City, IA).

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