Table 2.

caretaker-recall oral poliovirus vaccine immunization dose history of children with wild poliovirus cases at the time of investigation of acute flaccid paralysis, Nigeria, 2000-2016

Oral polio vaccine dose history of wild poliovirus cases	Frequency (n=5,127)	Percent
0	1,759	34.3
1	842	16.4
2	879	17.1
3	678	13.2
4	373	7.3
5	189	3.7
6	73	1.4
7	38	0.7
8	31	0.6
9	5	0.1
10	25	0.5
>10	20	0.4
No data	215	4.2