J Korean Soc Matern Child Health.  2017 Sep;21(3):176-181. 10.21896/jksmch.2017.21.3.176.

Investigation of Children with No Vaccinations Recorded on the National Immunization Registry Information System

  • 1Department of Preventive Medicine, School of Medicine, Chungnam National University, Korea. sgoolee@cnu.ac.kr
  • 2Department of Emergency Medical Technology, Daejeon Health Institute of Technology, Korea.
  • 3Division of VPD Control and NIP, Korea Centers for Disease Control and Prevention, Korea.


To improve the quality of the vaccination program, analyze the cause and identify the influencing factors for not being registered in the National Immunization Registry Information System even once.
We conducted one-on-one household visit interview surveys after, using a list supplemented with addresses from the Ministry of the Interior. We identified the basic respondent information, information on relevant children (those born in 2012), the reasons for omission from computerized vaccination registration, and the actual residence of the registered children.
The total number of unvaccinated children born in 2012 was 1,870. The final contact result of the household surveys was 1,254 successful contacts, 51 refused to be interviewed, and 565 were not found. The reason for missed vaccination registration was 928 cases of long-term stay overseas, 241 cases of missing registration owing to intentional refusal of vaccination, and 57 cases of illness. A comparison of complete vaccination rates between non-registrants and those of computerized registrants revealed rates of 17.9% and 96.3% for the 3 doses hepatitis B vaccine, 14.9% and 95.6% for the 4doses DTaP vaccine, 16.1% and 97.4% for the 3 doses polio vaccine, and 3.9% and 92.5% for the 3 (or 2) doses Japanese encephalitis vaccine, respectively.
Vaccination is the most effective national health policy and one of the most remarkable accomplishments in medical history. Through great effort, Korea has started to transcribe vaccination records since 2000, and the records are now reaching a considerable level. However, there is an unregistered population of around 0.3%. Several measures can be taken to improve the registration rate in the vaccination records, such as managing non-registrants through education and interviews, and sharing vaccination data with foreign countries. The non-registrant management plan should include periodically compiling a list of children who are not registered in the National Immunization Registry Information System, conducting of household visits using survey forms, and data analysis to establish appropriate measures.


unregistered residents in NIR; vaccination coverage rate

MeSH Terms

Diphtheria-Tetanus-acellular Pertussis Vaccines
Encephalitis, Japanese
Family Characteristics
Health Policy
Hepatitis B Vaccines
Information Systems*
Statistics as Topic
Surveys and Questionnaires
Diphtheria-Tetanus-acellular Pertussis Vaccines
Hepatitis B Vaccines
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