From: Immunity status against poliomyelitis in Germany: Determination of cut-off values in International Units
Polio 1
C<C0
C>=C0
Serum dil.< 1/4
90
11
Serum dil.>=1/4
12
2451
Polio 2
97
17
1
2449
Polio 3
182
0
82
2300