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Table 5 The associations between virulence genes among Escherichia coli in phylogenetic group A (n = 232)

From: Antibiotic resistance, serogroups, virulence genes, and phylogenetic groups of Escherichia coli isolated from yaks with diarrhea in Qinghai Plateau, China

Gene No. (%) of isolates in phylogroup A
(n = 232)
Associations of gene (OR, 95% confidence interval)*,a
sfa eaeA cnf1 etrA papC hlyA aer faeG rfc sepA
sfa 223 ns 8.5 (0.5–148.9) 0.2 (0.1–0.8)
eaeA 174 ns 28.4 (9.8–82.4) 17.5 (4.1–74.2) 9.2 (2.7–30.5) na
cnf1 122 28.4 (9.8–82.4) ns 65.8 (15.5–78.6) 32.3 (9.7–107.4) 6.4 (2.6–16.0) 7.1 (2.71–9.2) na
etrA 69 8.5 (0.5–148.9) 17.5 (4.1–74.2) 65.8 (15.5–278.6) ns 2.1 (1.0–4.2) 9.1 (1.8–44.9) na na
papC 61 9.2 (2.7–30.5) 32.3 (9.7–107.4) ns 41.8 (15.0–116.3) 14.3 (6.2–33.1) 62.1 (3.5–1084.4) 14.4 (0.7–304.5) 14.4 (0.7–304.5)
hlyA 39 6.4 (2.6–16.0) 2.1 (1.0–4.2) 41.8 (15.0–116.3) ns 5.1 (2.3–11.3) na
aer 36 0.2 (0.1–0.8) 7.1 (2.7–19.2) 14.3 (6.2–33.1) 5.1 (2.3–11.3) ns 23.4 (4.6–118.2) na
faeG 9 9.1 (1.8–44.9) 62.1 (3.5–1084.4) 23.4 (4.6–118.2) ns na 27.7 (1.6–484.6)
rfc 2 14.4 (0.7–304.5) ns 229 (7.7–684.3)
sepA 2 14.4 (0.7–304.5) 27.7 (1.6–484.6) 229 (7.7–684.3) ns
  1. –, indicates no significant associations (P ≥ 0.05); na, no results available (OR could not be calculated because none of the isolates carried one of the combinations of virulence genes or the value of one of the genes was a constant or zero); ns, no statistics were determined
  2. * Only virulence genes with a significant association (P < 0.05) are shown
  3. aOdds ratio (OR) for significant associations between virulence genes (95% confidence interval in parenthesis)