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Table 1 Frequency and associations between virulence genes and E. coli pathogroups

From: Virulence gene profiling of enterohemorrhagic (EHEC) and enteropathogenic (EPEC) Escherichia coli strains: a basis for molecular risk assessment of typical and atypical EPEC strains

Genetic element Virulence gene EHEC (n = 64) n, % (95%-CI)a typical EPEC (n = 73) n, % (95%-CI)a atypical EPEC (n = 235) n, % (95%-CI)a STEC (n = 52) n, % (95%-CI)a E. coli (n = 21) n, % (95%-CI)a
pMAR2 [12] bfpA 0, 0 (0;5.6) 68b , 93.2 c (84.7;97.7) 0, 0 (0;1.6) 0, 0 (0;6.8) 0, 0 (0;16.1)
pO157 [46] ehxA 61, 95.3c (86.9;99.0) 0, 0 (0;4.9) 65, 27.7 (22.0;33.9) 26, 50.0 c (35.8;64.2) 0, 0 (0;16.1
pO157 [46] espP 37, 57.8c (44.8;70.1) 1, 1.4 (0.03;7.4) 26, 11.1 (7.4;15.8) 14, 26.9c (15.6;41.0) 0, 0 (0;16.1)
pO157 [46] etpD 19, 29.7c (18.9;42.4) 3, 4.1 (0.86;11.5) 79, 33.6c (27.6;40.0) 0, 0 (0;6.8) 0, 0 (0;16.1)
pO157 [46] katP 36, 56.3c (43.3;68.6) 1, 1.4 (0.03;7.4) 40, 17 (12.4;22.4) 1, 1.9 (0.05;10.3) 0, 0 (0;16.1)
OI-71 [31] nleA 47, 73.4c (60.9;83.7) 17, 23.3 (14.2;34.6) 119, 50.6c (44.1;57.2) 0, 0 (0;6.8) 0, 0 (0;16.1)
OI-71 [31] nleF 45, 70.3c (57.6;81.1) 19, 26 (16.5;37.6 87, 37 (30.8;43.5) 0, 0 (0;6.8 0, 0 (0;16.1)
OI-71 [31] nleH1-2 63, 98.4c (91.6;100.0) 60, 82.2 (71.5;90.2) 205, 87.2c (82.3;91.2) 0, 0 (0;6.8) 0, 0 (0;16.1)
OI-122 [31] ent/espL2 64, 100.0c (94.4;100.0) 46, 63c (50.9;74.0) 129, 54.9 (48.3;61.4) 0, 0 (0;6.8) 0, 0 (0;16.1)
OI-122 [31] nleB 64, 100.0c (94.4;100.0) 46, 63c (50.9;74.0) 129, 54.9 (48.3;61.4) 0, 0 (0;6.8) 0, 0 (0;16.1
OI-122 [31] nleE 59, 92.2c (82.7;97.4) 46, 63c (50.9;74.0) 128, 54.5 (47.9;61.0) 0, 0 (0;6.8) 0, 0 (0;16.1)
OI-57 [31] nleG5 33, 51.6c (38.7;64.2) 9, 12.3 (5.8;22.1) 38, 16.2 (11.7;21.5) 0, 0 (0;6.8) 0, 0 (0;16.1)
OI-57 [31] nleG6-2 57, 89.1c (78.7;95.5) 9, 12.3 (5.8;22.1) 107, 45.5c (39.0;52.1) 0, 0 (0;6.8) 0, 0 (0;16.1)
CP-933N [31] espK 59, 92.2c (82.7;97.4) 14, 19.2 (10.9;30.1) 68, 28.9 (23.2;35.2) 0, 0 (0;6.8) 0, 0 (0;16.1)
Stx-phage [47] stx 1 39, 60.9c (47.9;72.9) 0, 0 (0;4.9) 0, 0 (0;1.6) 18, 34.6c (22.0;49.1) 0, 0 (0;16.1)
Stx-phage [31] stx 2 33, 51.6c (38.7;64.2) 0, 0 (0;4.9) 0, 0 (0;1.6) 48, 92.3c (81.5;97.9) 0, 0 (0;16.1)
LEE [31] eae 64, 100.0c (94.4;100.0) 73, 100c (95.1;100.0) 235, 100c (98.4;100.0) 0, 0 (0;6.8) 0, 0 (0;16.1)
  1. a) absolute (n) and relative frequencies (%) are shown and the exact 95% confidence level (95%-CI) [48]; b) five strains have lost the EAF plasmid encoding bfpA upon subculture; c) standardized residuals > 1 indicates a major influence on a significant chi-square test.