Table 1.

Characteristics of the 82 E. coliclinical strainsa

StrainOriginCarboxylesterase B ( MF)Expression of:GroupDetection ofPhylogenetic group
HemolysinMRHAK1 antigensfa/focoperonpap operonafaoperonhly operonaeroperonibe10 geneLethality in mice
1Feces70010B1
2Feces70010B1
3Feces70010B1
4Feces70010B1
5Feces7001+0B1
6Feces7001+0A
7Feces70010B1
8Feces70010A
9Feces70010B1
10Feces70010A
11Feces7001+0A
12Feces70010B1
13Feces70010A
14Feces7001+0A
15Feces70010A
16Blood72020A
17Urine72020A
18Urine7002++9B1
19Urine70020A
20Miscellaneous68020A
21Urine72020B1
22Urine70020A
23Urine70020A
24Urine70020B1
25Urine7002+0A
26Urine70020B1
27Urine70020B1
28Urine70020A
29Urine70020A
30Urine70020B1
31Urine70020B1
32Urine70020B1
33Urine68020B1
34Blood73430A
35Blood7223++10+D
36Miscellaneous7033++10+B1
37Miscellaneous7023++0A
38Miscellaneous6823++10+D
39Urine7223++10+B1
40Urine7033++0A
41Urine7233+0B1
42Urine7033+5B1
43Urine7043++0B1
44Urine70237A
45Urine70330B1
46Urine6204+++9B2
47Urine62040B2
48Blood60040B2
49Urine5704+10+B2
50Urine5704+0B2
51Urine5704++10+B2
52Urine5704++10+B2
53Urine5704+++0B2
54Urine5704+0B2
55Urine5704++10B2
56Urine5735+++9B2
57Urine5715++9+B2
58Urine6325+9+B2
59Urine6225+++10+B2
60Blood6225+++1B2
61Miscellaneous6225+++9B2
62Urine5735++10+B2
63Urine5725++10+B2
64Urine5715+++10+B2
65Miscellaneous6225++10+B2
66Urine6035+++9+B2
67Urine5735++0B2
68Urine5735+++3B2
69Miscellaneous6225++10+B2
70Urine5735+++10+B2
71Urine62+36++++10+B2
72Urine57+26+10+B2
73Blood57+26+++10+B2
74Urine57+36++++10+B2
75Miscellaneous57+36+++10+B2
76Urine57+26+++3B2
77Urine60+26+++10+B2
78Urine57+46++5B2
79Urine57+36+++10+B2
80Urine57+36+++10+B2
81Urine57+46+++9+B2
82Urine57+36+++10+B2
  • a Strains originating from feces are commensal (group 1), while the remainder were isolated from patients with pathological conditions (groups 2 to 6). Strains exhibiting a B1-type carboxylesterase B (MF ≈ 68 to 72) correspond to groups 1 to 3, while strains exhibiting a B2-type carboxylesterase B (MF ≈ 57 to 63) correspond to groups 4 to 6. MHRA was quantified from 0 to 4 according to the intensity of the reaction. The six groups (see Materials and Methods) are listed in order. The lethality in mice is indicated as the number of mice killed by the bacterial strain (0 to 10). A plus sign indicates that the bacterial strain killed at least six mice in less than 18 h. Phylogenetic groups A, B1, B2, and D are indicated as in reference 17.