Table 1.
Demographics of Study Subjects
| Enrolled Children | Household Contacts | |
|---|---|---|
| N | 72 | 144 |
| Mean age at enrollment (range) in years | 1.4 (0.3–2.5) | 22.5 (0.2–84.5) |
| Age distribution at Enrollment: | ||
| <6 y old | 72 (100%) | 13 (9%) |
| 6–10 y old | 0 (0%) | 33 (23%) |
| 11–20 y old | 0 (0%) | 22 (15%) |
| 21–30 y old | 0 (0%) | 42 (29%) |
| 31–40 y old | 0 (0%) | 21 (15%) |
| >40 y old | 0 (0%) | 13 (9%) |
| Gender: % female | 37 (51%) | 99 (69%) |
| Received OPV in May 2010 NIW | 35 (49%) | 4 (3%) |
| Received OPV in February 2011 NIWa | 47 (68%) | 6 (4%) |
| Received OPV in May 2011 NIWa | 46 (67%) | 7 (5%) |
| Received all recommended IPV doses for age at enrollment | 53 (74%) | NA |
| Mean prior IPV doses at enrollment | 2.9 | NA |
| International travel in the last 8 mo | 0 (0%) | 0 (0%) |
| Known Immunosuppression | 0 (0%) | 0 (0%) |
| Rural (vs urban) residence | 36 (50%) | 72 (50%) |
| Residence with dirt floor | 8 (11%) | 16 (11%) |
| Residence without indoor plumbing | 34 (47%) | 68 (47%) |
| Mean no. of children in household | 2.3 | 2.3 |
| Mean no. of children in household <6 y old | 1.8 | 1.8 |
Abbreviations: IPV, inactivated polio vaccine; NA, not applicable; NIW, National Immunization Weeks; OPV, oral polio vaccine.
a For the February and May 2011 NIWs, n = 69 for the enrolled children, and n = 138 for the household contacts.