Table 3 Distribution of virulence genes in different phylogroups and serogroups detected in Escherichia coli strains isolated from yaks with diarrhea (n = 292)
Virulence gene (s)a | No. (%) of isolates | Phylogenetic group, no. | Serogroup, no. | ||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
A | B1 | B2 | D | F | ß | O2 | O8 | O52 | O60 | O61 | O66 | O91 | O97 | O117 | O139 | O145 | O158 | O159 | O165 | O172 | NDb | ||
Total no. | 232 | 22 | 12 | 17 | 2 | 7 | 25 | 13 | 9 | 5 | 10 | 11 | 42 | 18 | 24 | 5 | 45 | 10 | 20 | 8 | 21 | 26 | |
sfa | 78 (26.7) | 46 | 12 | 5 | 10 | 1 | 4 | 8 | 6 | 2 | 1 | 1 | 3 | – | 11 | 12 | 3 | – | 6 | 8 | – | 5 | 12 |
eaeA | 5 (1.7) | 5 | – | – | – | – | – | 1 | – | – | – | – | – | 2 | – | – | – | 2 | – | – | – | – | – |
aer, cnf1 | 4 (1.4) | 4 | – | – | – | – | – | – | – | – | 1 | – | – | – | 1 | – | – | – | – | – | 1 | 1 | – |
eaeA, sfa | 63 (21.6) | 51 | 4 | 3 | 3 | 1 | 1 | 3 | 3 | 2 | – | – | 2 | 22 | – | 3 | – | 6 | – | – | 2 | 11 | 9 |
aer, hlyA, sfa | 3 (1.0) | 3 | – | – | – | – | – | – | – | – | – | – | – | 1 | – | – | – | 2 | – | – | – | – | – |
cnf1, eaeA, sfa | 16 (5.5) | 15 | 1 | – | – | – | – | 2 | – | – | 1 | 3 | – | – | – | – | – | – | – | 9 | 1 | – | – |
aer, etrA, hlyA, sfa | 2 (0.7) | 2 | – | – | – | – | – | – | – | 1 | – | – | – | – | – | – | – | – | 1 | – | – | – | – |
cnf1, eaeA, etrA, sfa | 45 (15.4) | 45 | – | – | – | – | – | 2 | 4 | 2 | 1 | 4 | 4 | 6 | 3 | 5 | – | 5 | 1 | – | 3 | 1 | 4 |
cnf1, eaeA, hlyA, sfa | 7 (2.4) | – | 3 | 2 | 2 | – | – | – | – | – | – | – | – | 2 | – | – | – | 2 | – | 1 | 1 | – | 1 |
cnf1, eaeA, papC, sfa | 9 (3.1) | 8 | 1 | – | – | – | – | 2 | – | – | 1 | – | – | – | 1 | 3 | – | – | – | 1 | – | 1 | – |
faeG, hlyA, papC, sfa | 2 (0.7) | 1 | – | – | – | – | 1 | – | – | – | – | – | – | – | – | – | – | 2 | – | – | – | – | – |
faeG, hlyA, rfc, sfa | 1 (0.3) | – | – | 1 | – | – | – | – | – | 1 | – | – | – | – | – | – | – | – | – | – | – | – | – |
faeG, papC, sfa, sepA | 1 (0.3) | 1 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | 1 | – |
papC, rfc, sfa, sepA | 1 (0.3) | 1 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | 1 | – |
aer, cnf1, eaeA, papC, sfa | 10 (3.4) | 10 | – | – | – | – | – | 2 | – | – | – | – | – | 1 | – | – | – | 7 | – | – | – | – | – |
cnf1, eaeA, hlyA, papC, sfa | 10 (3.4) | 8 | – | – | 1 | – | 1 | 2 | – | – | – | – | – | 5 | – | – | – | 3 | – | – | – | – | – |
aer, cnf1, eaeA, hlyA, papC, sfa | 9 (3.1) | 9 | – | – | – | – | – | 1 | – | 1 | – | 2 | 2 | – | – | – | – | – | 2 | 1 | – | – | – |
cnf1, eaeA, etrA, hlyA, papC, sfa | 15 (5.1) | 15 | – | – | – | – | – | – | – | – | – | – | – | 1 | – | – | 2 | 12 | – | – | – | – | – |
cnf1, etrA, faeG, papC, rfc, sfa | 1 (0.3) | – | – | – | 1 | – | – | – | – | – | – | – | – | – | 1 | – | – | – | – | – | – | – | – |
eaeA, faeG, hlyA, papC, rfc, sfa | 1 (0.3) | – | 1 | – | – | – | – | – | – | – | – | – | – | – | – | 1 | – | – | – | – | – | – | – |
aer, cnf1, eaeA, hlyA, papC, rfc, sfa | 1 (0.3) | 1 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | 1 | – | – | – | – | – |
aer, cnf1, eaeA, etrA, faeG, papC, sfa | 8 (2.7) | 7 | – | 1 | – | – | – | 2 | – | – | – | – | – | 2 | 1 | – | – | 3 | – | – | – | – | – |