Table 3.
Distribution of virulence factors in study isolates by phylogenetic group
| Virulence factor/Gene | Number and (%) of positive isolates | p value | ||||||
|---|---|---|---|---|---|---|---|---|
| B2 (n=63) | D (n=47) | A (n=18) | B1 (n=11) | Total (n=139) | B2 vs D | B2 vs A | B2 vs B1 | |
| Adhesin | ||||||||
| papA | 39 (62) | 26 (55) | 0 | 0 | 65 (45) | NS | <0.001 | <0.001 |
| papG I | 0 | 0 | 0 | 0 | 0 | |||
| papG II | 29 (46) | 33 (70) | 1 (6) | 0 | 63 (45) | 0.02 | <0.01 | <0.01 |
| papG III | 12 (19) | 4 (9) | 1 (6) | 0 | 17 (12) | 0.02 | NS | NS |
| fimH | 63 (100) | 37 (79) | 13 (72) | 10 (91) | 123 (88) | <0.001 | <0.001 | NS |
| afa/draBC | 4 (6) | 7 (23) | 1 (6) | 0 | 12 (9) | NS | NS | NS |
| sfa/focDE | 41 (65) | 1 (2) | 0 | 0 | 42 (30) | <0.001 | <0.001 | <0.001 |
| Toxins | ||||||||
| hlyA | 37 (59) | 0 | 0 | 0 | 37 (27) | <0.001 | <0.001 | <0.001 |
| cnf1 | 27 (43) | 0 | 0 | 0 | 27 (19) | <0.001 | <0.001 | <0.01 |
| Siderophore | ||||||||
| iutA | 45 (71) | 44 (94) | 12 (67) | 7 (64) | 108 (78) | <0.01 | NS | NS |
| fyuA | 59 (94) | 43 (91) | 12 (67) | 2 (18) | 116 (84) | NS | 0.01 | <0.001 |
| Invasin | ||||||||
| kpsMT II | 53 (84) | 39 (83) | 9 (50) | 1 (9) | 102 (73) | NS | <0.01 | <0.001 |
| ibeA | 11 (17) | 2 (4) | 0 | 0 | 13 (9) | NS | NS | NS |
| traT | 30 (48) | 31 (66) | 4 (22) | 6 (55) | 71 (51) | NS | NS | NS |
| Pathogenicity island | ||||||||
| MalX | 55 (87) | 11(23) | 1 (6) | 0 | 67 (48) | <0.001 | <0.001 | <0.001 |
|
Virulence Scorea mean; median |
7; 7 | 5; 5 | 3; 3 | 2; 3 | 6; 6 | <0.001 | <0.001 | <0.001 |
a
The sum of positive virulence traits, proposed by Moreno (2005)
NS: non-significant difference (p > 0.05)
Comparison of D with B1 and A groups revealed differences for genes papG II, fyuA and kpsMT II (D vs B1, p < 0.001); papA, papG II (D vs A, p < 0.001) and traT (D vs A, p < 0.003)