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Volume 11, Number 1—January 2005

Research

Genetic Background of Escherichia coli and Extended-spectrum β-Lactamase Type

Author affiliations: *Hôpital Louis Mourier, AP-HP, Colombes, France; †INSERM E0339, Paris, France; ‡Hôpital Nord, Amiens, France; §Hôpital Tenon, Paris, France; ¶Hôpital Trousseau, Paris, France; #Hôpital Morvan, Brest, France

Main Article

Table 4

Frequency of virulence factors among ciprofloxacin-susceptible and ciprofloxacin-resistant Escherichia coli strains involved in infection or colonization, according to extended-spectrum β-lactamase (ESBL) type

ESBL type (no. strains) No. (%) strains carrying
Virulence factor 
mean score
pap sfa/foc hly aer
Ciprofloxacin resistance
  TEM (15) 4 (20) 0 0 8 (53) 0.8
  SHV (3) 0 0 0 1 (33) 0.33
  CTX-M (27) 2 (7) 0 0 12 (44) 0.51
  All types (45) 6 (13) 0 0 21 (46) 0.6
Ciprofloxacin sensitivity
  TEM (40) 14 (35) 9 (22) 9 22) 9 (22) 1
  SHV (19) 13 (68) 8 (42) 9(47) 10(52) 2.1
  CTX-M (25) 5 (20) 1 (4) 1 (4) 13 (52) 0.8
  All types (84) 32 (55) 18 (21) 19 (22) 32 (38) 1.2
All strains
  TEM (55) 18 (33) 9 (16) 9 (16) 17 (31) 0.96
  SHV (22) 13 (59) 8 (36) 9 (4) 11 (50) 1.8
  CTX-M (52) 7 (13) 1 (2) 1 (2) 25 (48) 0.6
  All types (129) 38 (29.5) 18 (14) 19 (15) 53 (41) 1

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