Background: Immunization is an effort to prevent infectious diseases and is a priority for the Ministry of Health of the Republic of Indonesia (Kemenkes RI) as part of the program to reduce mortality rates among children under five years of age. The global mortality rate for children under five in 2022 was 37 per 1,000 live births. Currently, immunization prevents 3.5 to 5 million deaths annually from diseases such as diphtheria, tetanus, pertussis, influenza, and measles (WHO, 2024, cited in Yanti et al., 2025). Research Objective: This study generally aims to determine the relationship between family support and the success of basic immunization in two-year-old children in Tanak Beak Village. Research Type: This is a quantitative study utilizing a descriptive-correlational design with a cross-sectional approach. The study population consisted of toddlers aged two years, with a sample of 45 respondents selected via non-probability purposive sampling. Instruments: The study utilized a questionnaire and a checklist. Data Analysis: The study employed the Chi-square test. Research Results: The results showed that 26 respondents (57.8%) fell into the high family support category, while 19 respondents (42.2%) fell into the low family support category. Statistical analysis using the Chi-square test yielded a p-value of 0.006, which is less than α (0.05). Conclusion: There is a relationship between family support and the success of basic immunization in two-year-old children in Tanak Beak Village, North Batukliang District.
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