char = C;code = 67
char = h;code = 104
char = l;code = 108
char = o;code = 111
char = r;code = 114
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = -;code = 45
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = i;code = 105
char = s;code = 115
char = t;code = 116
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = b;code = 98
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = i;code = 105
char = a;code = 97
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = d;code = 100
char = r;code = 114
char = i;code = 105
char = n;code = 110
char = k;code = 107
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = r;code = 114
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 = 58
char = ;code = 32
char = D;code = 68
char = e;code = 101
char = t;code = 116
char = e;code = 101
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = a;code = 97
char = r;code = 114
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = i;code = 105
char = s;code = 115
char = t;code = 116
char = i;code = 105
char = c;code = 99
char = s;code = 115
char = ,;code = 44
char = ;code = 32
char = i;code = 105
char = d;code = 100
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = i;code = 105
char = f;code = 102
char = i;code = 105
char = c;code = 99
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ,;code = 44
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = l;code = 108
char = o;code = 111
char = r;code = 114
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = i;code = 105
char = s;code = 115
char = t;code = 116
char = a;code = 97
char = n;code = 110
char = c;code = 99
char = e;code = 101
char = ;code = 32
char = m;code = 109
char = e;code = 101
char = c;code = 99
char = h;code = 104
char = a;code = 97
char = n;code = 110
char = i;code = 105
char = s;code = 115
char = m;code = 109
char = s;code = 115
char = .;code = 46
result sql = Chlorine-resistant bacteria in drinking water system: Detection characteristics, identification, and chlorine resistance mechanisms.
Chlorine-resistant bacteria in drinking water system: Detection characteristics, identification, and chlorine resistance mechanisms.
char = T;code = 84
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = l;code = 108
char = o;code = 111
char = n;code = 110
char = g;code = 103
char = -;code = 45
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = m;code = 109
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = d;code = 100
char = e;code = 101
char = s;code = 115
char = p;code = 112
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = d;code = 100
char = ;code = 32
char = u;code = 117
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = l;code = 108
char = o;code = 111
char = r;code = 114
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = d;code = 100
char = i;code = 105
char = s;code = 115
char = i;code = 105
char = n;code = 110
char = f;code = 102
char = e;code = 101
char = c;code = 99
char = t;code = 116
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = s;code = 115
char = ;code = 32
char = h;code = 104
char = a;code = 97
char = v;code = 118
char = e;code = 101
char = ;code = 32
char = l;code = 108
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = e;code = 101
char = m;code = 109
char = e;code = 101
char = r;code = 114
char = g;code = 103
char = e;code = 101
char = n;code = 110
char = c;code = 99
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = l;code = 108
char = o;code = 111
char = r;code = 114
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = -;code = 45
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = i;code = 105
char = s;code = 115
char = t;code = 116
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = b;code = 98
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = i;code = 105
char = a;code = 97
char = ;code = 32
char = (;code = 40
char = C;code = 67
char = R;code = 82
char = B;code = 66
char = );code = 41
char = ,;code = 44
char = ;code = 32
char = w;code = 119
char = h;code = 104
char = i;code = 105
char = c;code = 99
char = h;code = 104
char = ;code = 32
char = h;code = 104
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = b;code = 98
char = e;code = 101
char = e;code = 101
char = n;code = 110
char = ;code = 32
char = f;code = 102
char = r;code = 114
char = e;code = 101
char = q;code = 113
char = u;code = 117
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = t;code = 116
char = e;code = 101
char = c;code = 99
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = d;code = 100
char = r;code = 114
char = i;code = 105
char = n;code = 110
char = k;code = 107
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = r;code = 114
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 = 46
char = ;code = 32
char = S;code = 83
char = o;code = 111
char = m;code = 109
char = e;code = 101
char = ;code = 32
char = C;code = 67
char = R;code = 82
char = B;code = 66
char = ;code = 32
char = a;code = 97
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = p;code = 112
char = a;code = 97
char = t;code = 116
char = h;code = 104
char = o;code = 111
char = g;code = 103
char = e;code = 101
char = n;code = 110
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = m;code = 109
char = a;code = 97
char = y;code = 121
char = ;code = 32
char = p;code = 112
char = o;code = 111
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = r;code = 114
char = i;code = 105
char = s;code = 115
char = k;code = 107
char = s;code = 115
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = p;code = 112
char = u;code = 117
char = b;code = 98
char = l;code = 108
char = i;code = 105
char = c;code = 99
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 = .;code = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = i;code = 105
char = s;code = 115
char = ;code = 32
char = s;code = 115
char = t;code = 116
char = u;code = 117
char = d;code = 100
char = y;code = 121
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = v;code = 118
char = e;code = 101
char = s;code = 115
char = t;code = 116
char = i;code = 105
char = g;code = 103
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = c;code = 99
char = c;code = 99
char = u;code = 117
char = r;code = 114
char = r;code = 114
char = e;code = 101
char = n;code = 110
char = c;code = 99
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = C;code = 67
char = R;code = 82
char = B;code = 66
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = d;code = 100
char = r;code = 114
char = i;code = 105
char = n;code = 110
char = k;code = 107
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = r;code = 114
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 = o;code = 111
char = f;code = 102
char = ;code = 32
char = a;code = 97
char = ;code = 32
char = m;code = 109
char = e;code = 101
char = g;code = 103
char = a;code = 97
char = c;code = 99
char = i;code = 105
char = t;code = 116
char = y;code = 121
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = n;code = 110
char = ;code = 32
char = C;code = 67
char = h;code = 104
char = i;code = 105
char = n;code = 110
char = a;code = 97
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = e;code = 101
char = x;code = 120
char = p;code = 112
char = l;code = 108
char = o;code = 111
char = r;code = 114
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = m;code = 109
char = e;code = 101
char = c;code = 99
char = h;code = 104
char = a;code = 97
char = n;code = 110
char = i;code = 105
char = s;code = 115
char = m;code = 109
char = s;code = 115
char = ;code = 32
char = u;code = 117
char = n;code = 110
char = d;code = 100
char = e;code = 101
char = r;code = 114
char = l;code = 108
char = y;code = 121
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = l;code = 108
char = o;code = 111
char = r;code = 114
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = i;code = 105
char = s;code = 115
char = t;code = 116
char = a;code = 97
char = n;code = 110
char = c;code = 99
char = e;code = 101
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = t;code = 116
char = y;code = 121
char = p;code = 112
char = i;code = 105
char = c;code = 99
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = C;code = 67
char = R;code = 82
char = B;code = 66
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = p;code = 112
char = o;code = 111
char = r;code = 114
char = t;code = 116
char = i;code = 105
char = o;code = 111
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 = 67
char = R;code = 82
char = B;code = 66
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 = t;code = 116
char = o;code = 111
char = t;code = 116
char = a;code = 97
char = l;code = 108
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 = a;code = 97
char = b;code = 98
char = l;code = 108
char = e;code = 101
char = ;code = 32
char = b;code = 98
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = i;code = 105
char = a;code = 97
char = ;code = 32
char = i;code = 105
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char = ;code = 32
char = s;code = 115
char = o;code = 111
char = u;code = 117
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char = w;code = 119
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char = t;code = 116
char = e;code = 101
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char = ,;code = 44
char = ;code = 32
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char = a;code = 97
char = p;code = 112
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = r;code = 114
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char = ;code = 32
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char = p;code = 112
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char = a;code = 97
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char = l;code = 108
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char = w;code = 119
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = w;code = 119
char = e;code = 101
char = r;code = 114
char = e;code = 101
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char = 0;code = 48
char = .;code = 46
char = 0;code = 48
char = 5;code = 53
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char = 1;code = 49
char = 6;code = 54
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char = 8;code = 56
char = &;code = 38
char = #;code = 35
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char = 2;code = 50
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char = 2;code = 50
char = f;code = 102
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char = %;code = 37
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char = ;code = 32
char = 3;code = 51
char = 9;code = 57
char = .;code = 46
char = 9;code = 57
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char = 1;code = 49
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char = 0;code = 48
char = &;code = 38
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char = 2;code = 50
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char = 2;code = 50
char = f;code = 102
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char = ,;code = 44
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char = a;code = 97
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char = d;code = 100
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char = 4;code = 52
char = 5;code = 53
char = .;code = 46
char = 5;code = 53
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char = #;code = 35
char = x;code = 120
char = 2;code = 50
char = 0;code = 48
char = 2;code = 50
char = f;code = 102
char = ;;code = 59
char = %;code = 37
char = ,;code = 44
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = p;code = 112
char = e;code = 101
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = e;code = 101
char = l;code = 108
char = y;code = 121
char = .;code = 46
char = ;code = 32
char = M;code = 77
char = y;code = 121
char = c;code = 99
char = o;code = 111
char = b;code = 98
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = e;code = 101
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char = u;code = 117
char = m;code = 109
char = ,;code = 44
char = ;code = 32
char = M;code = 77
char = e;code = 101
char = t;code = 116
char = h;code = 104
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char = l;code = 108
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char = a;code = 97
char = c;code = 99
char = t;code = 116
char = e;code = 101
char = r;code = 114
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char = u;code = 117
char = m;code = 109
char = ,;code = 44
char = ;code = 32
char = a;code = 97
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char = d;code = 100
char = ;code = 32
char = B;code = 66
char = a;code = 97
char = c;code = 99
char = i;code = 105
char = l;code = 108
char = l;code = 108
char = u;code = 117
char = s;code = 115
char = ;code = 32
char = w;code = 119
char = e;code = 101
char = r;code = 114
char = e;code = 101
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char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = m;code = 109
char = o;code = 111
char = s;code = 115
char = t;code = 116
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = e;code = 101
char = v;code = 118
char = a;code = 97
char = l;code = 108
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = s;code = 115
char = h;code = 104
char = a;code = 97
char = r;code = 114
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = C;code = 67
char = R;code = 82
char = B;code = 66
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = r;code = 114
char = e;code = 101
char = e;code = 101
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = s;code = 115
char = a;code = 97
char = m;code = 109
char = p;code = 112
char = l;code = 108
char = e;code = 101
char = s;code = 115
char = .;code = 46
char = ;code = 32
char = M;code = 77
char = y;code = 121
char = c;code = 99
char = o;code = 111
char = b;code = 98
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = i;code = 105
char = u;code = 117
char = m;code = 109
char = ;code = 32
char = m;code = 109
char = u;code = 117
char = c;code = 99
char = o;code = 111
char = g;code = 103
char = e;code = 101
char = n;code = 110
char = i;code = 105
char = c;code = 99
char = u;code = 117
char = m;code = 109
char = ;code = 32
char = T;code = 84
char = W;code = 87
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char = 3;code = 51
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char = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = i;code = 105
char = d;code = 100
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = i;code = 105
char = f;code = 102
char = i;code = 105
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = a;code = 97
char = ;code = 32
char = t;code = 116
char = y;code = 121
char = p;code = 112
char = i;code = 105
char = c;code = 99
char = a;code = 97
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char = ;code = 32
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char = R;code = 82
char = B;code = 66
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char = b;code = 98
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = d;code = 100
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char = o;code = 111
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result sql = The long-term and widespread use of chlorine disinfectants have led to the emergence of chlorine-resistant bacteria (CRB), which has been frequently detected in drinking water system. Some CRB are pathogenic and may pose risks to public health. This study investigated the occurrence of CRB in the drinking water system of a megacity in eastern China and explored the mechanisms underlying chlorine resistance in typical CRB. The proportions of CRB among total culturable bacteria in source water, tap water, and potable water were 0.05-16.8 %, 39.9-100 %, and 0-45.5 %, respectively. Mycobacterium, Methylobacterium, and Bacillus were the most prevalent shared CRB in the three water samples. Mycobacterium mucogenicum TW-3 was identified as a typical CRB based on its high detection frequency (100 %), high concentration (up to 26 CFU/mL), and notable resistance to chlorine disinfectant. Its resistance to reactive chlorine was attributed to the consumption of disinfectants by the extracellular polymeric substances, repair of membrane damage, and upregulation of antioxidant enzymes. Furthermore, TW-3 activated a thioredoxin-centered reducing system to mitigate chlorine dioxide-induced oxidative stress. These findings present important insights into the mechanisms underlying chlorine resistance in CRB and provide theoretical support for improving microbial safety control in the drinking water system.


Publication: J Hazard Mater 2025 Dec;501():140673.
Publication Date: Dec 2025
Study Author(s): Yan Chicheng C ; Ni Xuan X ; Luo Yuke Y ; Han Ziwei Z ; Guo Bingbing B ; Cui Changzheng C ;
Institution: State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China.
Shortcut link to this study:
The long-term and widespread use of chlorine disinfectants have led to the emergence of chlorine-resistant bacteria (CRB), which has been frequently detected in drinking water system. Some CRB are pathogenic and may pose risks to public health. This study investigated the occurrence of CRB in the drinking water system of a megacity in eastern China and explored the mechanisms underlying chlorine resistance in typical CRB. The proportions of CRB among total culturable bacteria in source water, tap water, and potable water were 0.05-16.8 %, 39.9-100 %, and 0-45.5 %, respectively. Mycobacterium, Methylobacterium, and Bacillus were the most prevalent shared CRB in the three water samples. Mycobacterium mucogenicum TW-3 was identified as a typical CRB based on its high detection frequency (100 %), high concentration (up to 26 CFU/mL), and notable resistance to chlorine disinfectant. Its resistance to reactive chlorine was attributed to the consumption of disinfectants by the extracellular polymeric substances, repair of membrane damage, and upregulation of antioxidant enzymes. Furthermore, TW-3 activated a thioredoxin-centered reducing system to mitigate chlorine dioxide-induced oxidative stress. These findings present important insights into the mechanisms underlying chlorine resistance in CRB and provide theoretical support for improving microbial safety control in the drinking water system.

PMID: 41352013

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