TABLE 4.
Prevalence of genes encoding iron-related outer membrane antigens among pathogenic and nonpathogenic E. coli isolates determined by hybridization and PCR
| Gene | No. (%) of isolates positive for genea
|
||
|---|---|---|---|
| Uropathogenic (n = 55) | Fecal-commensal (n = 30) | Diarrheagenic (n = 10) | |
| chuA | 48 (87)** | 9 (30) | 9 (90)* |
| c2482 | 38 (69)** | 5 (17) | 5 (50) |
| iha | 25 (45) | 11 (37) | 4 (40) |
| ireA | 11 (20) | 5 (17) | 2 (20) |
| iroN | 39 (71)* | 10 (33) | 7 (70) |
| iutA | 36 (65)** | 5 (17) | 8 (80)* |
a
*, P < 0.01 by Fisher's exact test (compared to fecal-commensal prevalence); **, P < 0.0001 by Fisher's exact test (compared to fecal-commensal prevalence).