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

Table 8 Serotypes of atypical EPEC Cluster 1 strains

Serotype^a	No. strains	Origin^b	%
O2:[H40]	3	h (1), a(2)	2.3
O3:[H8]	3	h (3)	2.3
O15:[H2]	2	h (2)	1.6
O26:[H11] ^c	20	h (9), a (11)	15.5
O55:H7	17	h (17)	13.2
O70:H11 ^d	5	a (5)	3.9
O76:[H7] ^e	5	h (5)	3.9
O80:[H2]^d	3	a (3)	2.3
O86:H11	2	h (2)	1.6
O100:[H25]	2	h (1)^d, a (1)	1.6
O103:H2 ^d	2	a (2)	1.6
O103:H25 ^d	4	a (3), f (1)	3.1
O111:[H11] ^d	2	h (2)	1.6
O117:[H40]	3	h (3)	2.3
O118:[H8]	3	h (3)	2.3
O119:[H8]	2	h (1), a (1)^d	1.6
O119:[H25] ^d	3	h (2), a (1)	2.3
O127:[H40]	7	h (7)	5.4
O128:[H2]	3	h (3)	2.3
O145:[H28] ^d	5	h (4), a (1)	3.9
O156:H8	2	h (1), a (1)^d	1.6
O157:[H7] ^d	3	h (3)	2.3
O177:H11 ^d	2	a (2)	1.6
Ont:[H2]^d	2	h (2)	1.6
Ont:[H21]	4	h (4)	3.1
Orough:[H40]	2	h (2)	1.6
single^f	18	see footnote to table	14.0
total	129		100.0

a) in bold: serotypes previously associated with Stx-production [3]
b) Origin and numbers (in brackets) of strains h = human, a = animal, f = food
c) Four O26:H11 strains from humans and seven from animals were positive for the EHEC-plasmid associated ehxA gene.
d) All strains were positive for ehxA.
e) One strain was positive for ehxA.
f) serotypes and strains represented each by one isolate only: O2:H8 (a), O3:H5 (f), O3:H40 (h), O15:H11 (a), O21:H25 (h), O22:[H7] (h), O45:H7 (a), O71:H40 (h), O76:H41 (a),O84:[H2] (a), O109:H25^d (a), O117:H25^d (h), O121:H- (h), O121:H19^d (h), O127:H8 (h), O128:H8 (h), O153:H14 (a), and Orough:[H7] (h)