TABLE 2.
| Pathotyped | Total no. of isolates (%)e | No. of isolates (%) |
|||
|---|---|---|---|---|---|
| LHR+f | LHR−f | XHR+f | XHR−f | ||
| EHEC | 582 (14.1) | 0 (0) | 582 (100) | 39 (6.7) | 543 (93.3) |
| STEC | 1,491 (36.2) | 3 (0.2) | 1,488 (99.8) | 81 (5.4) | 1,410 (94.6) |
| EPEC | 640 (15.5) | 0 (0) | 640 (100) | 55 (8.6) | 585 (91.4) |
| EC | 1,410 (34.2) | 467g (33) | 943g (67.9) | 176 (12.5) | 1,234g (87.5) |
| Total | 4,123 | 470 (11.4) | 3,653 (88.6) | 351 (8.5) | 3,772 (91.5) |
Values represent the number of E. coli isolates of each type that screened positive.
Presence of at least one region of locus of heat resistance (LHR) during four-plex PCR is considered LHR positive.
E. coli isolates surviving 60°C for 20 min are considered extremely heat resistant (XHR).
E. coli isolates possessing the stx and/or eae gene are considered to have a pathogenic background. Types of E. coli: enterohemorrhagic E. coli (EHEC; stx+ eae+), Shiga toxigenic E. coli (STEC; stx+ eae−), enteropathogenic E. coli (EPEC; stx− eae+), and nonpathogenic background E. coli (EC).
Numbers in parentheses are the percentage prevalence of each pathotype among total 4,123 isolates.
Numbers in parentheses are the percentage prevalence that screened positive among each pathotype.
The prevalence between pathogenic and nonpathogenic E. coli within a column is significantly different (P < 0.0001) as determined by Fisher’s exact test.