TABLE 2.
Intimin-negative STEC strains
| Serotypea | Toxin type(s)b | No. of strains (n = 253) |
|---|---|---|
| O1:H7 | 1 | 1 |
| O1:H20 | 1 | 2 |
| O2:H27 | 2 | 1 |
| O4:H10 | 1c+2c | 1 |
| O6:H12c | 1c | 1 |
| O11:H48c | 1 | 1 |
| O15:H8 | 2c | 3 |
| O22:H8d | 1c+2c, 1c, 2, 2c | 4 |
| O27:H30 | 2c | 1 |
| O28:H25 | 2 | 1 |
| O50:[H8]c | 1c+2c | 1 |
| O54:H25c | 1c+2c | 1 |
| O55:H9c | 1 | 1 |
| O60:[H4]c | 2e | 1 |
| O68:H18c | 2c | 1 |
| O71:[H12] | 1c+2c | 1 |
| O73:H18c | 2 | 1 |
| O76:[H19]d | 1c, 1c+2c | 15 |
| O77:H18 | 1+2 | 1 |
| O79:H14c | 1c | 1 |
| O88:H8c,d | 1, 2c | 2 |
| O88:H25c,d | 1, 2 | 2 |
| O91:H10 | 1+2 | 1 |
| O91:[H14]d | 1, 1+2c | 37 |
| O91:[H21]d | 1+2d, 2d, 1+2e | 6 |
| O104:[H21] | 1+2 | 2 |
| O105:H18 | 1+2 | 3 |
| O113:[H4]d | 1c, 2c | 17 |
| O113:[H21]d | 1+2d, 2+2d, 2d | 3 |
| O114:H4 | 1 | 1 |
| O115:H10 | 1 | 3 |
| O115:[H44] | 2c | 1 |
| O116:[H21] | 2 | 1 |
| O117:H7 | 2 | 1 |
| O118:H12 | 2c | 1 |
| O125:[H19]c | 1c+2c | 1 |
| O125:H10c | 1c | 1 |
| O128:H2d | 1c+2c, 2c | 23 |
| O132:[H19]c | 1c | 1 |
| O146:H21d | 1c, 2c, 1c+2c | 15 |
| O146:H28 | 2c | 7 |
| O148:H8c | 2d | 1 |
| O153:H25 | 2 | 1 |
| O154:[H31]c | 1 | 1 |
| O156:H21c | 1+2c | 1 |
| O163:[H19]d | 1, 2+2d | 3 |
| O166:H28d | 1c, 1c+2c | 4 |
| O174:H2 | 1+2 | 2 |
| O174:H16c | 2c | 1 |
| O174:H21 | 2d | 2 |
| O178:H7 | 1 | 1 |
| O179:H8c | 2 | 1 |
| O181:H16c | 1c+2c | 1 |
| Ont:H2 | 1c, 1+2 | 2 |
| Ont:H10 | 2e | 1 |
| Ont:[H19] | 2c+2e | 2 |
| Ont:[H21] | 2c+2d | 1 |
| Ont:[H28] | 1+2 | 1 |
| Ont:H31 | 1 | 1 |
| Orough:[H2]d | 1+2c, 1c+2c, 1, 2c | 13 |
| Orough:[H4]d | 1, 1c+2c | 2 |
| Orough:[H7] | 1c+2c | 1 |
| Orough:H8d | 1, 1c, 1c+2c | 3 |
| Orough:[H10] | 1c+2c | 1 |
| Orough:H12 | 2c | 1 |
| Orough:[H14]d | 1, 1c, 1+2c, 1c+2c | 27 |
| Orough:[H19]d | 1c, 2c, 1c+2c | 4 |
| Orough:H28d | 1c, 2c | 3 |
| Orough:[H45] | 1 | 1 |
| Orough:H56 | 2c | 1 |
O:H serotypes of STEC strains. An H type in brackets indicates the presence of NM strains, which were analyzed for their fliC type by PCR as described in Materials and Methods.
The toxin types of strains were determined on the basis of their stx genotypes as described above. Toxin types which were present in combination in all strains belonging to a given serotype are added together (for example, 1+2), and toxin types which were found in different combinations in strains belonging to one serotype are listed separately (for example, 1, 2).
STEC strain belonging to an O:H type which was not previously described to occur in humans.
Serotypes of STEC strains showing differences in their Shiga toxin types as follows: O22:H8, toxin types 1c (n = 1 strain), 1c+2c (n = 1), 2c (n = 1), and 2 (n = 1); O76:[H19], toxin types 1c (n = 5) and 1c+2c (n = 10); O88:H8, toxin types 1 (n = 1) and 2c (n = 1); O88:H25, toxin types 1 (n = 1) and 2 (n = 1); O91:[H14], toxin types 1 (n = 30) and 1+2c (n = 7); O91:[H21], toxin types 2d (n = 4), 1+2d (n = 1), and 1+2e (n = 1); O113:[H4], toxin types 1c (n = 3), 2c (n = 1), and 1c+2c (n = 13); O113:[H21], toxin types 1+2d (n = 1), 2d (n = 1), and 2+2d (n = 1); O128:H2, toxin types 1c+2c (n = 21) and 2c (n = 2); O146:H21, toxin types 1c+2c (n = 10), 2c (n = 3), and 1c (n = 2); O163:[H19], toxin types 1 (n = 1) and 2+2d (n = 2); O166:H28, toxin types 1c (n = 1) and 1c+2c (n = 3); Ont:H2, toxin types 1c (n = 1) and 1+2 (n = 1); Orough:H2, toxin types 1 (n = 1), 1c (n = 2), 1+2c (n = 3), 1c+2c (n = 6), and 2c (n = 1); Orough:[H4], toxin types 1 (n = 1) and 1c+2c (n = 1); Orough:H8, toxin types 1 (n = 1), 1c (n = 1), and 1c+2c (n = 1); Orough:[H14], toxin type 1 (n = 11), 1c (n = 2), 1+2c (n = 10), and 1c+2c (n = 4); Orough:[H19], toxin types 1c (n = 2) and 1c+2c (n = 2); and Orough:H28, toxin types 1c (n = 1) and 2c (n = 2).