Table 1.
Association between serogroups, pathotypes, and presence of mcr-1 gene among the 481 E. coli isolates involved in swine colibacillosis (Spain, 2006–2016).
| Serogroupa | ETEC N = 277 No. isolates (%) | aEPEC N = 156 No. isolates (%) | STEC/ETEC N = 33 No. isolates (%) | STEC N = 15 No. isolates (%) | mcr-1 N = 123 No. isolates (%) |
|---|---|---|---|---|---|
| O2 | 1 (0.4) | 6 (3.8) | – | 2 (13.3) | 8 (6.5) |
| O4 | – | 2 (1.3) | – | – | – |
| O5 | 1 (0.4) | 1 (0.6) | – | – | 1(0.8) |
| O7 | 3 (1.1) | – | – | – | 2 (1.6) |
| O8 | 4 (1.4) | – | – | – | 1 (0.8) |
| O14 | 1 (0.4) | – | – | – | – |
| O15 | 7 (2.5) | 5 (3.2) | – | – | 5 (4.1) |
| O20 | 4 (1.4) | 1 (0.6) | – | – | – |
| O22 | – | – | – | 1 (6.7) | – |
| O26 | – | 17 (10.9) | – | – | 7 (5.7) |
| O28 | – | 1 (0.6) | – | – | – |
| O35 | 5 (1.8) | – | – | – | 2 (1.6) |
| O36 | 1 (6.7) | 1(0.8) | |||
| O39 | – | 1 (0.6) | – | – | – |
| O45 | 9 (3.2) | 2 (1.3) | – | – | 6 (4.9) |
| O49 | – | 21 (13.5) | – | – | – |
| O51 | – | 2 (1.3) | – | – | 1 (0.8) |
| O55 | – | 1 (0.6) | – | – | – |
| O65 | – | – | 1 (3) | – | – |
| O76 | – | 6 (3.9) | – | – | – |
| O80 | – | 12 (7.7) | – | – | – |
| O81 | 1 (0.6) | 1(0.8) | |||
| O86 | – | – | 1 (3) | – | – |
| O88 | 1 (0.4) | 1 (0.6) | – | – | 1(0.8) |
| O98 | 2 (0.7) | – | – | – | – |
| O101 | 5 (1.8) | – | – | – | – |
| O103 | – | 5 (3.2) | – | – | 2 (1.6) |
| O108 | 43 (15.5) | 3 (1.9) | – | – | – |
| O111 | – | 11 (7.0) | – | – | 5 (4.1) |
| O115 | – | 2 (1.3) | – | – | – |
| O118 | 1 (0.4) | 1 (0.6) | – | – | 1 (0.8) |
| O123 | – | 5 (3.2) | – | – | 3 (2.4) |
| O127 | – | 2 (1.3) | – | – | – |
| O137 | 1 (0.4) | – | – | – | – |
| O138 | 15 (5.4) | – | 8 (24.2) | – | 10 (8.1) |
| O139 | – | – | – | 7 (46.7) | 1 (0.8) |
| O141 | 18 (6.5) | – | 11 (33.3) | – | 26 (21.1) |
| O142 | – | – | – | 1 (6.7) | – |
| O145 | – | 6 (3.9) | – | – | 2 (1.6) |
| O147 | 2 (0.7) | – | – | – | – |
| O149 | 14 (5.1) | – | – | – | – |
| O153 | – | 7 (4.5) | – | – | – |
| O157 | 57 (20.6) | 7 (4.5) | 1 (3) | – | 26 (21.1) |
| O158 | – | – | – | 1 (6.7) | – |
| O159 | 1(0.4) | – | 1 (3) | – | 1 (0.8) |
| O163 | 1 (0.4) | – | – | – | – |
| O169 | 1 (0.4) | – | – | – | – |
| O174 | – | 1 (0.6) | – | – | – |
| O177 | – | 3 (1.9) | – | – | 1 (0.8) |
| O180 | – | 1 (0.6) | – | – | – |
| ONT | 80 (28.9) | 22 (14.1) | 10 (30.3) | 2 (13.3) | 9 (7.3) |
aIsolates that did not react with any O antisera were classified as non-typeable (ONT).