Characterization of Shiga Toxin-Producing Escherichia coli Isolated from Ground Beef Collected in Different Socioeconomic Strata Markets in Buenos Aires, Argentina
Table 1
Characterization of Shiga toxin-producing E.coli according to their strata, market, and round of sampling.
Serotype
Virulence profile
stx2 subtype
Strata market (sampling round)
O2:H25
stx2
stx2/stx2d***
M7 (6)
S
O8:H16
Ehly, ehxA, stx1
—
M1 (5)
s
O8:H19
Ehly, ehxA, stx2, stx1, saa
stx2
M4 (2)
O15:H27
Ehly, ehxA, stx2, saa
stx2
H8 (2)
stx2
stx2c-vhb
M1 (1)
AMP
s
O26:H11
ehxA, eae, stx1
—
M7 (6)
O79:H19
Ehly, ehxA, stx2, saa
stx2
L6 (2)
Ehly, ehxA, stx2, stx1, saa
stx2
L11 (4)
O82:H8
Ehly, ehxA, stx2, saa
stx2/stx2c-vhb/stx2d***
L8 (7)
S, AK
amp, cn, na, te, f
O113:H21
Ehly, ehxA, stx2, saa
stx2/stx2c-vhb
H11 (3)
s
stx2
stx2c-vha
M7 (3)
s
O130:H11
Ehly, ehxA, stx2, saa
stx2c-vhb/stx2d***
L3 (4)
s
O153:H21
Ehly, ehxA, stx2
stx2
H8 (3)
s
O156:NM
stx2
stx2
H1 (2)
AMP
O157:H7
Ehly, ehxA, eae, stx2, stx1
stx2c-vha
L9 (5)
na
Ehly, ehxA, eae, stx2
stx2
H10 (2)
AMP
stx2/stx2c-vha
L1 (7); L7 (1)
ehxA, eae, stx2
stx2
L5 (7)
te
stx2
M12 (2)****
stx2/stx2c-vha
M2 (7)****
S, TE
M12 (7)****
S
te
L9 (6)
s
stx2c-vha
M2 (5)****
O157:NM
Ehly, ehxA, eae, stx2
stx2/stx2c-vha
M1 (2)
O174:H21
stx2
stx2c-vhb/stx2d***
M11 (4)
s
stx2c-vhb
L3 (3); L12 (5)
O174:H28
Ehly, ehxA, stx2, saa
stx2
M11 (4)
s
O178:H19
Ehly, ehxA, stx2, stx1, saa
stx2c-vhb
H10 (1)
s
Ehly, ehxA, stx2
stx2/stx2d***
M9 (1)
stx2c-vhb/stx2d***
H7 (3)
ehxA, stx2
stx2c-vha/vhb
M6 (1)
stx2
stx2c-vha/vhb
H1 (1)
stx2c-vha
H4 (2); M10 (5); L1 (2)
AMP
s
M2 (4); M11 (4)
s
stx2c-vhb
M7 (1)
AMP
s
H5 (1); L7 (3)
s
O179:H8
Ehly, ehxA, stx2, saa
stx2
L9 (3)
s
ONT:H7
α-hemol, ehxA, stx2
stx2
M10 (1)
S
stx2
stx2/stx2c-vha
L10 (1)
stx2c-vha
H6 (6)
S
ak
ONT:H8
Ehly, ehxA, stx2, saa
stx2c-vhb/stx2d***
L3 (2)
AMP
s
stx2
stx2
M7 (2)
stx2c-vha
M2 (4)
ONT:H19
Ehly, ehxA, eae, stx2
stx2
L1 (7)
S
te
ehxA, eae, stx2
stx2/stx2c-vha
M8 (6)
amp, s
ONT:H21
Ehly, ehxA, stx2, saa
stx2/stx2c-vhb
L3 (1)
ONT:H46
Ehly, ehxA, stx2, saa
stx2c-vhb/stx2d***
M4 (5)
amp, s
ONT:NM
stx2
stx2c-vha
H11 (1)
stx2c-vhb
L1 (3)
OR:NM
Ehly, ehxA, eae, stx1
—
M2 (2)
ND
Ehly, ehxA, stx2, stx1, saa
stx2
H1 (7)
S
te
AMP, amp: ampicillin; AK, ak: amikacin; S, s: streptomycin; cn: gentamicin; Te, te: tetracycline; na: nalidixic acid; f: nitrofurantoin. Socioeconomic strata: H: high, M: medium, L: low. : antimicrobial resistance. : reduced susceptibility.
***Mucus-activatable stx2d variant (Zheng et al. 2008) [10].
****Strains from different sampling rounds in the same markets (M2 (5, 7) and M12 (2, 7)) belonging to the same serotype showed differences by subtyping and antibiotyping.
