Table 20-2.
Predominant Serogroups, Mechanisms, and Gene Codes Associated with Enterotoxigenic, Enteroinvasive, Enteropathogenic, Enterohemorrhagic, and Enteroaggregative Escherichia coli
| ETEC | EIEC | EPEC | EHEC | EAEC |
|---|---|---|---|---|
| Class I Serogroup | ||||
| LT | O28ac | O157:H7 | O3:H2 | |
| O6:K15 | O29, O112 | O55:K59 (B5) | O26:H11/H- | O44 |
| O8:K40 | O115, O124 | O111ab:K88 (B4) | O128, O103:H2 | O78:H33 |
| O136, O144 | O119K6a (B14) | O39 | O15:H11 | |
| LT and ST | O147, O152 | O125ac:K70 (B15) | O111:K58:H8/H- | O77:H18 |
| O11:H27 | O164 | O126:K71 (B16) | O113:K75:H7/H21 | O51:H11 |
| O15, O20:K79 | O127a:K63 (B8) | O121:H-, O145:H- | And many others | |
| O25:K7 | O128abc:K67 (B12) | Rough | ||
| O27, O63 | O142, O158 | And many others | ||
| O80, O85, O139 | ||||
| Class II Serogroup | ||||
| ST | ||||
| O groups 78, 115 | O44:K74 | |||
| 128, 148, 149, 153 | O86a:K61 (B7) | |||
| 159, 166, 167 | O114:H2 | |||
| Mechanisms | ||||
| Adenylate or guanylate cyclase activation | Colonic invasiveness (e.g., Shigella) | Localized attachment and effacement | Shiga toxins block protein synthesis; attachment and effacement | Aggregative adherence and toxins |
| Gene Codes | ||||
| Plasmid | Chromosomal and plasmid | Chromosomal and plasmid | Phage and chromosomal | Plasmid and chromosomal |
| ETEC, enterotoxigenic Escherichia coli; EIEC, enteroinvasive E. coli; EPEC, enteropathogenic E. coli; EHEC, enterohemorrhagic E. coli; EAEC, enteroaggregative E. coli; LT, heat-labile toxin; ST, heat-stable toxin. | ||||