Table 2.
Phenotypic traits, phylogroups, and virulence factors according to origin and survival abilities of 88 E. coli and Escherichia clade strainsb
| Phenotypic trait | Bodies of water (58 strains) |
Controls (30 strains) |
||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Total no. (%) | No. of strains in survival group: |
Total no. (%) | No. of strains in human survival group: |
No. of strains in bovine survival group: |
||||||||||
| S1 (n = 6) | S2 (n = 23) | S3 (n = 14) | S4 (n = 15) | S1 (n = 4) | S2 (n = 3) | S3 (n = 2) | S4 (n = 6) | S1 (n = 0) | S2 (n = 8) | S3 (n = 5) | S4 (n = 2) | |||
| Metabolism of macromolecules: pectin, gelatin, Tween 40 | ||||||||||||||
| None | 20 (34.5) | 1 | 9 | 6 | 4 | 15 (50) | 1 | 0 | 1 | 1 | 0 | 5 | 5 | 2 |
| 1 | 15 (25.8) | 2 | 5 | 2 | 6 | 6 (20) | 0 | 1 | 1 | 3 | 0 | 1 | 0 | 0 |
| 2 | 14 (24.2) | 0 | 6 | 5 | 3 | 8 (26.7) | 2 | 2 | 0 | 2 | 0 | 2 | 0 | 0 |
| 3 | 9 (15.5) | 2 | 3 | 2 | 2 | 1 (3.3) | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| E. coli phylogroup | ||||||||||||||
| A | 3 | 5 | 3 | 6 | 2 | 1 | 1 | 3 | 0 | 0 | 1 | 0 | ||
| B1 | 3 | 12 | 5 | 4 | 1 | 0 | 0 | 0 | 0 | 7 | 4 | 2 | ||
| B2 | 0 | 0 | 2 | 1 | 1 | 1 | 0 | 3 | 0 | 0 | 0 | 0 | ||
| C | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | ||
| D | 0 | 3 | 3 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | ||
| Clade V | 0 | 3 | 1 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||
| Virulence gene(s)a | ||||||||||||||
| No virulence factor | 10 (17.2) | 0 | 4 | 1 | 5 | 7 (23.3) | 0 | 1 | 0 | 1 | 0 | 1 | 2 | 2 |
| 1 virulence factor | 18 (31) | 3 | 6 | 7 | 2 | 3 (10) | 0 | 0 | 1 | 0 | 0 | 2 | 0 | 0 |
| 2 or 3 virulence factors | 23 (39.7) | 3 | 13 | 1 | 6 | 15 (50) | 3 | 1 | 1 | 2 | 0 | 5 | 3 | 0 |
| 4 to 8 virulence factors | 7 (12.1) | 0 | 0 | 5 | 2 | 5 (26.7) | 1 | 1 | 0 | 3 | 0 | 0 | 0 | 0 |
a
Virulence factors involved in intraintestinal infection were absent in all strains.
b
n = total number of strains in each collection.