char = H;code = 72
char = e;code = 101
char = r;code = 114
char = d;code = 100
char = ;code = 32
char = i;code = 105
char = m;code = 109
char = m;code = 109
char = u;code = 117
char = n;code = 110
char = i;code = 105
char = t;code = 116
char = y;code = 121
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = m;code = 109
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = l;code = 108
char = e;code = 101
char = s;code = 115
char = .;code = 46
result sql = Herd immunity and measles.

Herd immunity and measles.

char = T;code = 84
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = b;code = 98
char = a;code = 97
char = s;code = 115
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = n;code = 110
char = c;code = 99
char = e;code = 101
char = p;code = 112
char = t;code = 116
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = h;code = 104
char = e;code = 101
char = r;code = 114
char = d;code = 100
char = ;code = 32
char = i;code = 105
char = m;code = 109
char = m;code = 109
char = u;code = 117
char = n;code = 110
char = i;code = 105
char = t;code = 116
char = y;code = 121
char = ;code = 32
char = i;code = 105
char = s;code = 115
char = ;code = 32
char = d;code = 100
char = i;code = 105
char = r;code = 114
char = e;code = 101
char = c;code = 99
char = t;code = 116
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = a;code = 97
char = p;code = 112
char = p;code = 112
char = l;code = 108
char = i;code = 105
char = c;code = 99
char = a;code = 97
char = b;code = 98
char = l;code = 108
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = n;code = 110
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = u;code = 117
char = n;code = 110
char = d;code = 100
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = v;code = 118
char = e;code = 101
char = r;code = 114
char = y;code = 121
char = ;code = 32
char = s;code = 115
char = p;code = 112
char = e;code = 101
char = c;code = 99
char = i;code = 105
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = n;code = 110
char = d;code = 100
char = i;code = 105
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
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 = g;code = 103
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = f;code = 102
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 = m;code = 109
char = u;code = 117
char = s;code = 115
char = t;code = 116
char = ;code = 32
char = b;code = 98
char = e;code = 101
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = t;code = 116
char = r;code = 114
char = i;code = 105
char = c;code = 99
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = a;code = 97
char = ;code = 32
char = s;code = 115
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = l;code = 108
char = e;code = 101
char = ;code = 32
char = h;code = 104
char = o;code = 111
char = s;code = 115
char = t;code = 116
char = ;code = 32
char = s;code = 115
char = p;code = 112
char = e;code = 101
char = c;code = 99
char = i;code = 105
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = i;code = 105
char = n;code = 110
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 = t;code = 116
char = r;code = 114
char = a;code = 97
char = n;code = 110
char = s;code = 115
char = m;code = 109
char = i;code = 105
char = s;code = 115
char = s;code = 115
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = o;code = 111
char = c;code = 99
char = c;code = 99
char = u;code = 117
char = r;code = 114
char = s;code = 115
char = ;code = 32
char = b;code = 98
char = y;code = 121
char = ;code = 32
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 = v;code = 118
char = e;code = 101
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = d;code = 100
char = i;code = 105
char = r;code = 114
char = e;code = 101
char = c;code = 99
char = t;code = 116
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = n;code = 110
char = t;code = 116
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = ,;code = 44
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
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 = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = d;code = 100
char = u;code = 117
char = c;code = 99
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = s;code = 115
char = o;code = 111
char = l;code = 108
char = i;code = 105
char = d;code = 100
char = ;code = 32
char = i;code = 105
char = m;code = 109
char = m;code = 109
char = u;code = 117
char = n;code = 110
char = i;code = 105
char = t;code = 116
char = y;code = 121
char = .;code = 46
char = ;code = 32
char = A;code = 65
char = l;code = 108
char = s;code = 115
char = o;code = 111
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 = m;code = 109
char = u;code = 117
char = s;code = 115
char = t;code = 116
char = ;code = 32
char = o;code = 111
char = c;code = 99
char = c;code = 99
char = u;code = 117
char = r;code = 114
char = ;code = 32
char = o;code = 111
char = n;code = 110
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = r;code = 114
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = o;code = 111
char = m;code = 109
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = m;code = 109
char = i;code = 105
char = x;code = 120
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = p;code = 112
char = o;code = 111
char = p;code = 112
char = u;code = 117
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 = s;code = 115
char = .;code = 46
char = ;code = 32
char = I;code = 73
char = n;code = 110
char = ;code = 32
char = f;code = 102
char = r;code = 114
char = e;code = 101
char = e;code = 101
char = -;code = 45
char = l;code = 108
char = i;code = 105
char = v;code = 118
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = p;code = 112
char = o;code = 111
char = p;code = 112
char = u;code = 117
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 = s;code = 115
char = ,;code = 44
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = s;code = 115
char = c;code = 99
char = e;code = 101
char = p;code = 112
char = t;code = 116
char = i;code = 105
char = b;code = 98
char = l;code = 108
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = a;code = 97
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = n;code = 110
char = o;code = 111
char = t;code = 116
char = ;code = 32
char = d;code = 100
char = i;code = 105
char = s;code = 115
char = t;code = 116
char = r;code = 114
char = i;code = 105
char = b;code = 98
char = u;code = 117
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = h;code = 104
char = o;code = 111
char = m;code = 109
char = o;code = 111
char = g;code = 103
char = e;code = 101
char = n;code = 110
char = e;code = 101
char = o;code = 111
char = u;code = 117
char = s;code = 115
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = b;code = 98
char = u;code = 117
char = t;code = 116
char = ;code = 32
char = t;code = 116
char = e;code = 101
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = c;code = 99
char = l;code = 108
char = u;code = 117
char = s;code = 115
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = b;code = 98
char = g;code = 103
char = r;code = 114
char = o;code = 111
char = u;code = 117
char = p;code = 112
char = s;code = 115
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = f;code = 102
char = i;code = 105
char = n;code = 110
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 = g;code = 103
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = b;code = 98
char = y;code = 121
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = c;code = 99
char = h;code = 104
char = ;code = 32
char = f;code = 102
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = o;code = 111
char = r;code = 114
char = s;code = 115
char = ;code = 32
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = e;code = 101
char = t;code = 116
char = h;code = 104
char = n;code = 110
char = i;code = 105
char = c;code = 99
char = i;code = 105
char = t;code = 116
char = y;code = 121
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = s;code = 115
char = o;code = 111
char = c;code = 99
char = i;code = 105
char = o;code = 111
char = e;code = 101
char = c;code = 99
char = o;code = 111
char = n;code = 110
char = o;code = 111
char = m;code = 109
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = s;code = 115
char = t;code = 116
char = a;code = 97
char = t;code = 116
char = u;code = 117
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 = r;code = 114
char = e;code = 101
char = q;code = 113
char = u;code = 117
char = i;code = 105
char = s;code = 115
char = i;code = 105
char = t;code = 116
char = e;code = 101
char = ;code = 32
char = f;code = 102
char = o;code = 111
char = r;code = 114
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 = e;code = 101
char = p;code = 112
char = i;code = 105
char = d;code = 100
char = e;code = 101
char = m;code = 109
char = i;code = 105
char = c;code = 99
char = s;code = 115
char = ,;code = 44
char = ;code = 32
char = n;code = 110
char = a;code = 97
char = m;code = 109
char = e;code = 101
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = a;code = 97
char = ;code = 32
char = l;code = 108
char = a;code = 97
char = r;code = 114
char = g;code = 103
char = e;code = 101
char = ;code = 32
char = e;code = 101
char = n;code = 110
char = o;code = 111
char = u;code = 117
char = g;code = 103
char = h;code = 104
char = ;code = 32
char = n;code = 110
char = u;code = 117
char = m;code = 109
char = b;code = 98
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = s;code = 115
char = c;code = 99
char = e;code = 101
char = p;code = 112
char = t;code = 116
char = i;code = 105
char = b;code = 98
char = l;code = 108
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = i;code = 105
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 = ;code = 32
char = c;code = 99
char = o;code = 111
char = n;code = 110
char = t;code = 116
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = e;code = 101
char = a;code = 97
char = c;code = 99
char = h;code = 104
char = ;code = 32
char = o;code = 111
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = r;code = 114
char = ,;code = 44
char = ;code = 32
char = e;code = 101
char = x;code = 120
char = i;code = 105
char = s;code = 115
char = t;code = 116
char = s;code = 115
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = v;code = 118
char = i;code = 105
char = r;code = 114
char = t;code = 116
char = u;code = 117
char = a;code = 97
char = l;code = 108
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = a;code = 97
char = l;code = 108
char = l;code = 108
char = ;code = 32
char = l;code = 108
char = a;code = 97
char = r;code = 114
char = g;code = 103
char = e;code = 101
char = ;code = 32
char = p;code = 112
char = o;code = 111
char = p;code = 112
char = u;code = 117
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 = s;code = 115
char = ,;code = 44
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = g;code = 103
char = a;code = 97
char = r;code = 114
char = d;code = 100
char = l;code = 108
char = e;code = 101
char = s;code = 115
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
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 = 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 = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = p;code = 112
char = o;code = 111
char = p;code = 112
char = u;code = 117
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 = t;code = 116
char = h;code = 104
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = i;code = 105
char = s;code = 115
char = ;code = 32
char = i;code = 105
char = m;code = 109
char = m;code = 109
char = u;code = 117
char = n;code = 110
char = e;code = 101
char = .;code = 46
char = ;code = 32
char = E;code = 69
char = x;code = 120
char = p;code = 112
char = e;code = 101
char = r;code = 114
char = i;code = 105
char = e;code = 101
char = n;code = 110
char = c;code = 99
char = e;code = 101
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = m;code = 109
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = l;code = 108
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = i;code = 105
char = l;code = 108
char = l;code = 108
char = u;code = 117
char = s;code = 115
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = n;code = 110
char = d;code = 100
char = i;code = 105
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = s;code = 115
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = o;code = 111
char = t;code = 116
char = a;code = 97
char = l;code = 108
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 = c;code = 99
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = i;code = 105
char = m;code = 109
char = m;code = 109
char = u;code = 117
char = n;code = 110
char = i;code = 105
char = t;code = 116
char = y;code = 121
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = g;code = 103
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = a;code = 97
char = n;code = 110
char = ;code = 32
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = e;code = 101
char = q;code = 113
char = u;code = 117
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = 9;code = 57
char = 0;code = 48
char = %;code = 37
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = v;code = 118
char = e;code = 101
char = l;code = 108
char = o;code = 111
char = p;code = 112
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = u;code = 117
char = n;code = 110
char = t;code = 116
char = r;code = 114
char = i;code = 105
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = d;code = 100
char = o;code = 111
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = n;code = 110
char = o;code = 111
char = t;code = 116
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = e;code = 101
char = v;code = 118
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = n;code = 110
char = u;code = 117
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = e;code = 101
char = p;code = 112
char = i;code = 105
char = d;code = 100
char = e;code = 101
char = m;code = 109
char = i;code = 105
char = c;code = 99
char = s;code = 115
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 = h;code = 104
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = s;code = 115
char = c;code = 99
char = e;code = 101
char = p;code = 112
char = t;code = 116
char = i;code = 105
char = b;code = 98
char = l;code = 108
char = e;code = 101
char = s;code = 115
char = ,;code = 44
char = ;code = 32
char = m;code = 109
char = o;code = 111
char = s;code = 115
char = t;code = 116
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = w;code = 119
char = h;code = 104
char = o;code = 111
char = m;code = 109
char = ;code = 32
char = a;code = 97
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = i;code = 105
char = l;code = 108
char = d;code = 100
char = r;code = 114
char = e;code = 101
char = n;code = 110
char = ;code = 32
char = y;code = 121
char = o;code = 111
char = u;code = 117
char = n;code = 110
char = g;code = 103
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = a;code = 97
char = n;code = 110
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 = y;code = 121
char = e;code = 101
char = a;code = 97
char = r;code = 114
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = a;code = 97
char = g;code = 103
char = e;code = 101
char = .;code = 46
char = ;code = 32
char = W;code = 87
char = h;code = 104
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = v;code = 118
char = a;code = 97
char = c;code = 99
char = c;code = 99
char = i;code = 105
char = n;code = 110
char = a;code = 97
char = t;code = 116
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 = w;code = 119
char = i;code = 105
char = d;code = 100
char = e;code = 101
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = c;code = 99
char = e;code = 101
char = d;code = 100
char = ,;code = 44
char = ;code = 32
char = a;code = 97
char = s;code = 115
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 = U;code = 85
char = n;code = 110
char = i;code = 105
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = S;code = 83
char = t;code = 116
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = s;code = 115
char = i;code = 105
char = n;code = 110
char = c;code = 99
char = e;code = 101
char = ;code = 32
char = 1;code = 49
char = 9;code = 57
char = 6;code = 54
char = 2;code = 50
char = ,;code = 44
char = ;code = 32
char = m;code = 109
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = l;code = 108
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = h;code = 104
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = n;code = 110
char = t;code = 116
char = i;code = 105
char = n;code = 110
char = u;code = 117
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = o;code = 111
char = c;code = 99
char = c;code = 99
char = u;code = 117
char = r;code = 114
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = p;code = 112
char = o;code = 111
char = o;code = 111
char = r;code = 114
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = i;code = 105
char = m;code = 109
char = m;code = 109
char = u;code = 117
char = n;code = 110
char = i;code = 105
char = z;code = 122
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = b;code = 98
char = g;code = 103
char = r;code = 114
char = o;code = 111
char = u;code = 117
char = p;code = 112
char = s;code = 115
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = a;code = 97
char = r;code = 114
char = e;code = 101
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 = z;code = 122
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = b;code = 98
char = y;code = 121
char = ;code = 32
char = l;code = 108
char = o;code = 111
char = w;code = 119
char = ;code = 32
char = e;code = 101
char = d;code = 100
char = u;code = 117
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 = a;code = 97
char = l;code = 108
char = ;code = 32
char = l;code = 108
char = e;code = 101
char = v;code = 118
char = e;code = 101
char = l;code = 108
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = e;code = 101
char = c;code = 99
char = o;code = 111
char = n;code = 110
char = o;code = 111
char = m;code = 109
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = s;code = 115
char = t;code = 116
char = a;code = 97
char = t;code = 116
char = u;code = 117
char = s;code = 115
char = ,;code = 44
char = ;code = 32
char = v;code = 118
char = e;code = 101
char = r;code = 114
char = y;code = 121
char = ;code = 32
char = y;code = 121
char = o;code = 111
char = u;code = 117
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = a;code = 97
char = g;code = 103
char = e;code = 101
char = ,;code = 44
char = ;code = 32
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = l;code = 108
char = i;code = 105
char = g;code = 103
char = i;code = 105
char = o;code = 111
char = u;code = 117
char = s;code = 115
char = ;code = 32
char = b;code = 98
char = e;code = 101
char = l;code = 108
char = i;code = 105
char = e;code = 101
char = f;code = 102
char = s;code = 115
char = ;code = 32
char = f;code = 102
char = o;code = 111
char = r;code = 114
char = b;code = 98
char = i;code = 105
char = d;code = 100
char = d;code = 100
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = a;code = 97
char = c;code = 99
char = c;code = 99
char = e;code = 101
char = p;code = 112
char = t;code = 116
char = a;code = 97
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 = v;code = 118
char = a;code = 97
char = c;code = 99
char = c;code = 99
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = .;code = 46
char = ;code = 32
char = U;code = 85
char = l;code = 108
char = t;code = 116
char = i;code = 105
char = m;code = 109
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = c;code = 99
char = c;code = 99
char = e;code = 101
char = s;code = 115
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = a;code = 97
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 = a;code = 97
char = t;code = 116
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = i;code = 105
char = m;code = 109
char = m;code = 109
char = u;code = 117
char = n;code = 110
char = i;code = 105
char = z;code = 122
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = g;code = 103
char = r;code = 114
char = a;code = 97
char = m;code = 109
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = q;code = 113
char = u;code = 117
char = i;code = 105
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = k;code = 107
char = n;code = 110
char = o;code = 111
char = w;code = 119
char = l;code = 108
char = e;code = 101
char = d;code = 100
char = g;code = 103
char = e;code = 101
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = d;code = 100
char = i;code = 105
char = s;code = 115
char = t;code = 116
char = r;code = 114
char = i;code = 105
char = b;code = 98
char = u;code = 117
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 = 115
char = u;code = 117
char = s;code = 115
char = c;code = 99
char = e;code = 101
char = p;code = 112
char = t;code = 116
char = i;code = 105
char = b;code = 98
char = l;code = 108
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = b;code = 98
char = y;code = 121
char = ;code = 32
char = a;code = 97
char = g;code = 103
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = b;code = 98
char = g;code = 103
char = r;code = 114
char = o;code = 111
char = u;code = 117
char = p;code = 112
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 = x;code = 120
char = i;code = 105
char = m;code = 109
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = e;code = 101
char = f;code = 102
char = f;code = 102
char = o;code = 111
char = r;code = 114
char = t;code = 116
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = d;code = 100
char = u;code = 117
char = c;code = 99
char = e;code = 101
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = n;code = 110
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 = 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 = 115
char = u;code = 117
char = s;code = 115
char = c;code = 99
char = e;code = 101
char = p;code = 112
char = t;code = 116
char = i;code = 105
char = b;code = 98
char = l;code = 108
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = r;code = 114
char = o;code = 111
char = u;code = 117
char = g;code = 103
char = h;code = 104
char = o;code = 111
char = u;code = 117
char = t;code = 116
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = m;code = 109
char = m;code = 109
char = u;code = 117
char = n;code = 110
char = i;code = 105
char = t;code = 116
char = y;code = 121
char = ;code = 32
char = r;code = 114
char = a;code = 97
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = a;code = 97
char = n;code = 110
char = ;code = 32
char = a;code = 97
char = i;code = 105
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = c;code = 99
char = h;code = 104
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = y;code = 121
char = ;code = 32
char = s;code = 115
char = p;code = 112
char = e;code = 101
char = c;code = 99
char = i;code = 105
char = f;code = 102
char = i;code = 105
char = c;code = 99
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 = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = o;code = 111
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 = 32
char = p;code = 112
char = o;code = 111
char = p;code = 112
char = u;code = 117
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 = 46
char = <;code = 60
char = b;code = 98
char = r;code = 114
char = /;code = 47
char = >;code = 62
result sql = The basic concept of herd immunity is directly applicable only under very special conditions. The agents of disease must be restricted to a single host species within which transmission occurs by relatively direct contact, and infection induces solid immunity. Also outbreaks must occur only in randomly mixing populations. In free-living populations, susceptibles are not distributed homogeneously but tend to cluster in subgroups defined by age and by such factors as ethnicity and socioeconomic status. The requisite for occurrence of epidemics, namely a large enough number of susceptibles in frequent contact with each other, exists in virtually all large populations, regardless of the total proportion of the population that is immune. Experience with measles illustrates these conditions. Total prevalence of immunity of greater than or equal to 90% in developing countries does not prevent annual epidemics among the susceptibles, most of whom are children younger than three years of age. Where vaccination is widely practiced, as in the United States since 1962, measles has continued to occur in poorly immunized subgroups that are characterized by low educational level and economic status, very young age, or religious beliefs forbidding acceptance of vaccine. Ultimate success of a systematic immunization program requires knowledge of distribution of susceptibles by age and subgroup and maximal effort to reduce the concentration of susceptibles throughout the community rather than aiming to reach any specific proportion of the overall population.

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The order of these related concepts is determined by a statistical analysis of the scientific literature. Highest-frequency concepts appear first.

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