Risk factors of underutilization of childhood immunizations in ultraorthodox Jewish communities in Israel despite high access to health care services

► The determinants of childhood vaccines underutilization were studied in ultraorthodox Jewish communities. ► Parental religious beliefs against vaccination correlated with under-immunization. ► Mistrust in the Ministry of Health increased the risk of vaccines underutilization. ► Perceiving the risk of vaccine preventable diseases as low also correlated with under-immunization. ► Some determinants of under-immunization are modifiable by means of health education.