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char = e;code = 101
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char = m;code = 109
char = o;code = 111
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char = g;code = 103
char = ;code = 32
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char = s;code = 115
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char = e;code = 101
char = r;code = 114
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char = c;code = 99
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char = i;code = 105
char = a;code = 97
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char = c;code = 99
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char = l;code = 108
char = i;code = 105
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char = O;code = 79
char = 1;code = 49
char = 5;code = 53
char = 7;code = 55
char = :;code = 58
char = H;code = 72
char = 7;code = 55
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char = t;code = 116
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char = i;code = 105
char = s;code = 115
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char = e;code = 101
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char = n;code = 110
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char = a;code = 97
char = s;code = 115
char = e;code = 101
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char = a;code = 97
char = k;code = 107
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char = r;code = 114
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char = a;code = 97
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char = y;code = 121
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char = c;code = 99
char = a;code = 97
char = t;code = 116
char = t;code = 116
char = l;code = 108
char = e;code = 101
char = .;code = 46
result sql = Differences in virulence among Escherichia coli O157:H7 strains isolated from humans during disease outbreaks and from healthy cattle.
Differences in virulence among Escherichia coli O157:H7 strains isolated from humans during disease outbreaks and from healthy cattle.
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char = ;code = 32
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char = f;code = 102
char = i;code = 105
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char = a;code = 97
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char = t;code = 116
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char = e;code = 101
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char = o;code = 111
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char = s;code = 115
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char = a;code = 97
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char = p;code = 112
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char = e;code = 101
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char = a;code = 97
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char = ;code = 32
char = a;code = 97
char = g;code = 103
char = e;code = 101
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char = o;code = 111
char = f;code = 102
char = ;code = 32
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char = e;code = 101
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char = r;code = 114
char = o;code = 111
char = r;code = 114
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char = s;code = 115
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char = .;code = 46
char = ;code = 32
char = A;code = 65
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char = t;code = 116
char = h;code = 104
char = o;code = 111
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char = g;code = 103
char = h;code = 104
char = ;code = 32
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char = e;code = 101
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char = H;code = 72
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char = t;code = 116
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char = c;code = 99
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char = v;code = 118
char = e;code = 101
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char = f;code = 102
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char = e;code = 101
char = q;code = 113
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char = t;code = 116
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char = i;code = 105
char = o;code = 111
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char = e;code = 101
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char = m;code = 109
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char = ;code = 32
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char = f;code = 102
char = e;code = 101
char = c;code = 99
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char = s;code = 115
char = ;code = 32
char = d;code = 100
char = o;code = 111
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char = e;code = 101
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char = A;code = 65
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char = ;code = 32
char = o;code = 111
char = u;code = 117
char = t;code = 116
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char = r;code = 114
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char = a;code = 97
char = k;code = 107
char = s;code = 115
char = ;code = 32
char = a;code = 97
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char = o;code = 111
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char = d;code = 100
char = e;code = 101
char = t;code = 116
char = e;code = 101
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char = m;code = 109
char = i;code = 105
char = n;code = 110
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char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = r;code = 114
char = r;code = 114
char = e;code = 101
char = l;code = 108
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = b;code = 98
char = e;code = 101
char = t;code = 116
char = w;code = 119
char = e;code = 101
char = e;code = 101
char = n;code = 110
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = d;code = 100
char = u;code = 117
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = S;code = 83
char = h;code = 104
char = i;code = 105
char = g;code = 103
char = a;code = 97
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = x;code = 120
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = 1;code = 49
char = ;code = 32
char = (;code = 40
char = S;code = 83
char = t;code = 116
char = x;code = 120
char = 1;code = 49
char = );code = 41
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = S;code = 83
char = t;code = 116
char = x;code = 120
char = 2;code = 50
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = v;code = 118
char = i;code = 105
char = r;code = 114
char = u;code = 117
char = l;code = 108
char = e;code = 101
char = n;code = 110
char = c;code = 99
char = e;code = 101
char = .;code = 46
char = ;code = 32
char = O;code = 79
char = v;code = 118
char = e;code = 101
char = r;code = 114
char = a;code = 97
char = l;code = 108
char = l;code = 108
char = ,;code = 44
char = ;code = 32
char = E;code = 69
char = .;code = 46
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = l;code = 108
char = i;code = 105
char = ;code = 32
char = O;code = 79
char = 1;code = 49
char = 5;code = 53
char = 7;code = 55
char = :;code = 58
char = H;code = 72
char = 7;code = 55
char = ;code = 32
char = s;code = 115
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = i;code = 105
char = n;code = 110
char = s;code = 115
char = ;code = 32
char = i;code = 105
char = s;code = 115
char = o;code = 111
char = l;code = 108
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = f;code = 102
char = r;code = 114
char = o;code = 111
char = m;code = 109
char = ;code = 32
char = h;code = 104
char = e;code = 101
char = a;code = 97
char = l;code = 108
char = t;code = 116
char = h;code = 104
char = y;code = 121
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = t;code = 116
char = t;code = 116
char = l;code = 108
char = e;code = 101
char = ;code = 32
char = w;code = 119
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = l;code = 108
char = e;code = 101
char = s;code = 115
char = s;code = 115
char = ;code = 32
char = v;code = 118
char = i;code = 105
char = r;code = 114
char = u;code = 117
char = l;code = 108
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = g;code = 103
char = n;code = 110
char = o;code = 111
char = t;code = 116
char = o;code = 111
char = b;code = 98
char = i;code = 105
char = o;code = 111
char = t;code = 116
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = p;code = 112
char = i;code = 105
char = g;code = 103
char = l;code = 108
char = e;code = 101
char = t;code = 116
char = s;code = 115
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = a;code = 97
char = n;code = 110
char = ;code = 32
char = s;code = 115
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = i;code = 105
char = n;code = 110
char = s;code = 115
char = ;code = 32
char = i;code = 105
char = s;code = 115
char = o;code = 111
char = l;code = 108
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = f;code = 102
char = r;code = 114
char = o;code = 111
char = m;code = 109
char = ;code = 32
char = h;code = 104
char = u;code = 117
char = m;code = 109
char = a;code = 97
char = n;code = 110
char = s;code = 115
char = ;code = 32
char = d;code = 100
char = u;code = 117
char = r;code = 114
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = d;code = 100
char = i;code = 105
char = s;code = 115
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = u;code = 117
char = t;code = 116
char = b;code = 98
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = k;code = 107
char = s;code = 115
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = m;code = 109
char = o;code = 111
char = u;code = 117
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = S;code = 83
char = t;code = 116
char = x;code = 120
char = 2;code = 50
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = d;code = 100
char = u;code = 117
char = c;code = 99
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = b;code = 98
char = y;code = 121
char = ;code = 32
char = E;code = 69
char = .;code = 46
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = l;code = 108
char = i;code = 105
char = ;code = 32
char = O;code = 79
char = 1;code = 49
char = 5;code = 53
char = 7;code = 55
char = :;code = 58
char = H;code = 72
char = 7;code = 55
char = ;code = 32
char = s;code = 115
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = i;code = 105
char = n;code = 110
char = s;code = 115
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = r;code = 114
char = r;code = 114
char = e;code = 101
char = l;code = 108
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = s;code = 115
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = v;code = 118
char = i;code = 105
char = r;code = 114
char = u;code = 117
char = l;code = 108
char = e;code = 101
char = n;code = 110
char = c;code = 99
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = m;code = 109
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = u;code = 117
char = r;code = 114
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = b;code = 98
char = y;code = 121
char = ;code = 32
char = a;code = 97
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = d;code = 100
char = u;code = 117
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = p;code = 112
char = i;code = 105
char = g;code = 103
char = l;code = 108
char = e;code = 101
char = t;code = 116
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = r;code = 114
char = v;code = 118
char = i;code = 105
char = v;code = 118
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = s;code = 115
char = i;code = 105
char = g;code = 103
char = n;code = 110
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = c;code = 99
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = n;code = 110
char = e;code = 101
char = r;code = 114
char = v;code = 118
char = o;code = 111
char = u;code = 117
char = s;code = 115
char = ;code = 32
char = s;code = 115
char = y;code = 121
char = s;code = 115
char = t;code = 116
char = e;code = 101
char = m;code = 109
char = ;code = 32
char = d;code = 100
char = i;code = 105
char = s;code = 115
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = d;code = 100
char = u;code = 117
char = e;code = 101
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = b;code = 98
char = r;code = 114
char = a;code = 97
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = f;code = 102
char = a;code = 97
char = r;code = 114
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = m;code = 109
char = o;code = 111
char = u;code = 117
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = S;code = 83
char = t;code = 116
char = x;code = 120
char = 1;code = 49
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = d;code = 100
char = u;code = 117
char = c;code = 99
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = c;code = 99
char = u;code = 117
char = l;code = 108
char = t;code = 116
char = u;code = 117
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = n;code = 110
char = o;code = 111
char = t;code = 116
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = r;code = 114
char = r;code = 114
char = e;code = 101
char = l;code = 108
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = l;code = 108
char = e;code = 101
char = n;code = 110
char = g;code = 103
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = t;code = 116
char = i;code = 105
char = m;code = 109
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = p;code = 112
char = i;code = 105
char = g;code = 103
char = l;code = 108
char = e;code = 101
char = t;code = 116
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = r;code = 114
char = v;code = 118
char = i;code = 105
char = v;code = 118
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = s;code = 115
char = i;code = 105
char = g;code = 103
char = n;code = 110
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = c;code = 99
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = n;code = 110
char = e;code = 101
char = r;code = 114
char = v;code = 118
char = o;code = 111
char = u;code = 117
char = s;code = 115
char = ;code = 32
char = s;code = 115
char = y;code = 121
char = s;code = 115
char = t;code = 116
char = e;code = 101
char = m;code = 109
char = ;code = 32
char = d;code = 100
char = i;code = 105
char = s;code = 115
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = .;code = 46
char = ;code = 32
char = W;code = 87
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = g;code = 103
char = g;code = 103
char = e;code = 101
char = s;code = 115
char = t;code = 116
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = d;code = 100
char = i;code = 105
char = s;code = 115
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = u;code = 117
char = t;code = 116
char = b;code = 98
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = k;code = 107
char = s;code = 115
char = ;code = 32
char = s;code = 115
char = e;code = 101
char = l;code = 108
char = e;code = 101
char = c;code = 99
char = t;code = 116
char = ;code = 32
char = f;code = 102
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = d;code = 100
char = u;code = 117
char = c;code = 99
char = e;code = 101
char = r;code = 114
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = h;code = 104
char = i;code = 105
char = g;code = 103
char = h;code = 104
char = ;code = 32
char = l;code = 108
char = e;code = 101
char = v;code = 118
char = e;code = 101
char = l;code = 108
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = S;code = 83
char = t;code = 116
char = x;code = 120
char = 2;code = 50
char = ;code = 32
char = a;code = 97
char = m;code = 109
char = o;code = 111
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = E;code = 69
char = .;code = 46
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = l;code = 108
char = i;code = 105
char = ;code = 32
char = O;code = 79
char = 1;code = 49
char = 5;code = 53
char = 7;code = 55
char = :;code = 58
char = H;code = 72
char = 7;code = 55
char = ;code = 32
char = s;code = 115
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = i;code = 105
char = n;code = 110
char = s;code = 115
char = ;code = 32
char = s;code = 115
char = h;code = 104
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = b;code = 98
char = y;code = 121
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = i;code = 105
char = m;code = 109
char = a;code = 97
char = l;code = 108
char = s;code = 115
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = f;code = 102
char = u;code = 117
char = r;code = 114
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = g;code = 103
char = g;code = 103
char = e;code = 101
char = s;code = 115
char = t;code = 116
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = S;code = 83
char = t;code = 116
char = x;code = 120
char = 1;code = 49
char = ;code = 32
char = e;code = 101
char = x;code = 120
char = p;code = 112
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = s;code = 115
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = i;code = 105
char = s;code = 115
char = ;code = 32
char = u;code = 117
char = n;code = 110
char = l;code = 108
char = i;code = 105
char = k;code = 107
char = e;code = 101
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = b;code = 98
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = i;code = 105
char = g;code = 103
char = n;code = 110
char = i;code = 105
char = f;code = 102
char = i;code = 105
char = c;code = 99
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = h;code = 104
char = u;code = 117
char = m;code = 109
char = a;code = 97
char = n;code = 110
char = ;code = 32
char = o;code = 111
char = u;code = 117
char = t;code = 116
char = b;code = 98
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = k;code = 107
char = s;code = 115
char = .;code = 46
char = <;code = 60
char = b;code = 98
char = r;code = 114
char = /;code = 47
char = >;code = 62
result sql = Escherichia coli O157:H7 causes life-threatening outbreaks of diarrhea, hemorrhagic colitis, and hemolytic-uremic syndrome in humans and significant economic loss in agriculture and could be a potential agent of bioterrorism. Although the prevalence of E. coli O157:H7 in cattle and other species with which humans have frequent contact is high, human infections are relatively uncommon, despite a low infectious dose. A plausible explanation for the low disease incidence is the possibility that not all strains are virulent in humans. If there are substantial differences in virulence among strains in nature, then human disease may select for high virulence. We used a gnotobiotic piglet model to investigate the virulence of isolates from healthy cattle and from humans in disease outbreaks and to determine the correlation between production of Shiga toxin 1 (Stx1) and Stx2 and virulence. Overall, E. coli O157:H7 strains isolated from healthy cattle were less virulent in gnotobiotic piglets than strains isolated from humans during disease outbreaks. The amount of Stx2 produced by E. coli O157:H7 strains correlated with strain virulence as measured by a reduction in piglet survival and signs of central nervous system disease due to brain infarction. The amount of Stx1 produced in culture was not correlated with the length of time of piglet survival or with signs of central nervous system disease. We suggest that disease outbreaks select for producers of high levels of Stx2 among E. coli O157:H7 strains shed by animals and further suggest that Stx1 expression is unlikely to be significant in human outbreaks.

Publication: Appl. Environ. Microbiol. 2007 Nov ;73(22)::7338-46.
Publication Date: 2007 Nov
Study Author(s): Baker, Diane R;Moxley, Rodney A;Steele, Mike B;Lejeune, Jeffrey T;Christopher-Hennings, Jane;Chen, Ding-Geng;Hardwidge, Philip R;Francis, David H;
Institution: Department of Veterinary Science, South Dakota State University, Brookings, SD 57007, USA.
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Escherichia coli O157:H7 causes life-threatening outbreaks of diarrhea, hemorrhagic colitis, and hemolytic-uremic syndrome in humans and significant economic loss in agriculture and could be a potential agent of bioterrorism. Although the prevalence of E. coli O157:H7 in cattle and other species with which humans have frequent contact is high, human infections are relatively uncommon, despite a low infectious dose. A plausible explanation for the low disease incidence is the possibility that not all strains are virulent in humans. If there are substantial differences in virulence among strains in nature, then human disease may select for high virulence. We used a gnotobiotic piglet model to investigate the virulence of isolates from healthy cattle and from humans in disease outbreaks and to determine the correlation between production of Shiga toxin 1 (Stx1) and Stx2 and virulence. Overall, E. coli O157:H7 strains isolated from healthy cattle were less virulent in gnotobiotic piglets than strains isolated from humans during disease outbreaks. The amount of Stx2 produced by E. coli O157:H7 strains correlated with strain virulence as measured by a reduction in piglet survival and signs of central nervous system disease due to brain infarction. The amount of Stx1 produced in culture was not correlated with the length of time of piglet survival or with signs of central nervous system disease. We suggest that disease outbreaks select for producers of high levels of Stx2 among E. coli O157:H7 strains shed by animals and further suggest that Stx1 expression is unlikely to be significant in human outbreaks.
PMID: 17890332

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