Timeliness and completion rate of immunization among Nigerian children attending a clinic-based immunization service.

To achieve maximal protection against vaccine-preventable diseases, a child should receive all immunizations within recommended intervals. Clinic records of 512 Nigerian children were evaluated for timeliness in receiving vaccines and the completion rates of the schedule. About 30% of the children presented after four weeks of age for their first immunization; 18.9-65% of the children were delayed in receiving various vaccines compared to the recommended ages for receiving the vaccines. Only 227 (44.3%) children were fully immunized. Health education and mass mobilization of the community and health workers are recommended to improve the uptake of vaccines and to encourage timely receipt of vaccines.