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Description of study groups and biological samples obtained.
| Study group | Birth | 0–14 wks. | 22 wks. | 23 wks. | 26 wks. |
|---|---|---|---|---|---|
| 1 | Enrolment | Different primary polio immunization schedules | tOPV | ||
| 2 | mOPV2 | ||||
| 3 | tOPV+IPV | ||||
| 4 | mOPV2+mIPV2 | ||||
| Samples collected |
Blood Stool |
Blood Stool |
Blood |
