IntroductionUnderimmunization of CHD children is a public health concern in China. This study aimed to analyze the vaccination status of CHD children to provide additional evidence on optimal vaccination strategies and to make suggestions to promote appropriate vaccination services for these children.MethodsThis cross-sectional study evaluated 155 CHD children who received at least one vaccine at Peking University First Hospital. Vaccine-specific immunization rates were calculated. A telephone questionnaire survey was conducted that covered the following: the prognosis, reasons for delayed vaccinations and getting vaccination in the hospital. All statistical analyses were performed using the SPSS version 22 software.ResultsThe left-to-right shunt group involved 138 children, while the other type CHD group involved 17. The vaccination rate was the highest for MPSV-AC (87.1%) and the lowest for DTaP (40.1%). The most frequent reason for vaccination in the hospital was refusal from community health centers (61.5%). No participant reported vaccine-related adverse effects.ConclusionsThe age-appropriate vaccine-specific immunization rates in CHD children are low, with the lowest for DTaP. Refusal of community health centers was the primary reason. Our findings support that clinically stable CHD children may be safely vaccinated on a schedule similar to that of ordinary children in China.ImpactFrom our investigation, we found that the age-appropriate vaccine-specific immunization rates in children with CHD in China are low, with the lowest for diphtheria and tetanus toxoid and acellular pertussis.Refusal of community health centers to vaccinate was the primary reason for the low rates.We believe our study provides additional evidence on optimal vaccination strategies for children with CHD and it can be used to develop strategies to promote appropriate vaccination services for these children.