Delayed Childhood Immunization and its Associated Factors in Children under 2 Years of Age in Kelambakkam, Chengalpattu District

Introduction: Immunisation is the most effective public health intervention for reducing morbidity and mortality among young children. Even though we have witnessed an increase in immunization status, the lag in vaccinating younger children and the rural-urban gap in immunizing kids is still a matter of concern. Any disruption in the ongoing immunization services might even contribute to the initiation of the secondary outbreak of vaccine-preventable diseases. Methodology: A cross-sectional study was conducted to assess the immunization status of children under 2 years of age in Kelambakkam, along with the determinants of missed/delayed immunization using a semi-structured questionnaire to the parents of children below 2 years of age residing in Kelambakkam area of Chengalpattu district. Results: Delay in immunization was recorded in 34.28% of children among the entire study participants. Vaccines like MR1 (Measles, Rubella), and PCV Booster given at 9 months were delayed in 25% of children. Immunization delay and birth order of the baby were found to be significantly associated with each other. Conclusion: The delivery of basic health services like childhood immunization in Chengalpattu was majorly disrupted due to the ongoing pandemic. The findings of our study may be considered a basic reference for implementing any plan of action to improve childhood vaccination coverage during an epidemic or natural disaster or pandemic.