582. Pediatric vaccine completion and compliance in the Military Health System, 2006–2016

Abstract Background Few studies have reported on pediatric vaccination trends among military beneficiaries, though some evidence suggests military dependents have lower vaccination rates than their civilian counterparts. No prior work has examined timeliness of vaccinations in this population. Here, we assessed completion of and compliance with rotavirus; inactivated polio virus (IPV); and diphtheria, tetanus, and acellular-pertussis (DTaP) vaccination among military beneficiaries. Methods Department of Defense Birth and Infant Health Research program data were used to identify infants born at military treatment facilities (MTFs), 2006–2016. Infants were required to be enrolled in TRICARE within the first year of life, continuously enrolled through 2 years of age thereafter, and have at least 1 immunization at an MTF and 1 well-child visit annually by age 2. Immunization status was assessed using vaccine administered and Current Procedural Terminology codes from MTF immunization records and outpatient health care records, respectively. Completion of rotavirus (2 doses), IPV (3 doses), and DTaP (4 doses) vaccination was assessed by 2 years of age. Vaccine compliance was assessed by additionally applying the Advisory Committee on Immunization Practices childhood immunization schedule. Results A total of 317,348 infants were identified for vaccination assessment. Completion and compliance for all vaccines increased between 2006 and 2016, though there were wide disparities between the two measures, particularly for the DTaP series. While 89.8% of infants born between 2009 and 2016 (n=228,641) received 2 doses of rotavirus, 3 doses of IPV, and 3 doses of DTaP by 2 years of age, only 80.5% received a fourth dose of DTaP. More than 40.0% of infants were undervaccinated for at least 1 day before age 2, 2014–2016. Percent of infants born to military beneficiaries who complete and are compliant with vaccine recommendations, by vaccine series and overall, Department of Defense Birth and Infant Health Research program data, 2006–2016 (n=317,348). Conclusion Rotavirus, IPV, and DTaP vaccine coverage appeared higher in this population of military children than what has been reported nationally, but gaps remain. Providers serving military beneficiaries should ensure infants return for a care visit during the 15- to 18-month age window in order to remain compliant with the DTaP series and limit periods of undervaccination. Disclosures All Authors: No reported disclosures.