This study aims to analyze the factors influencing Complete Basic Immunization (IDL) in infants in Kupang City in 2021. The method used is analytic descriptive with a cross-sectional design. The data obtained were analyzed using the chi-square test. The results showed that the factor of vaccine availability obtained a p-value of 0.000, the completeness of immunization equipment was 0.038 and the vaccine expiration date was 0.121. In conclusion, there is a significant relationship between the completeness of immunization kits and vaccine availability on IDL coverage in Kupang City in 2021. Keywords: Infant, Complete Basic Immunization
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