Delayed immunization against vaccine preventable diseases--factors responsible among children under 5 years of age.

In the present case-control study, out of the the eleven risk factors of delayed immunization, only seven, namely family size, sex, number of children < 5 years, material education, paternal education, distance from health centre and low socio-economic status were found to be significantly associated. The common causes for delayed immunization were negligence on part of parents, unawareness about the use of vaccine and sickness of child. Thus, health education of the parents is recommended.