Immunization initiation among infants in the Oregon Health Plan

Immunization Coverage of Children in Care of the Child Welfare System in High-Income Countries: A Systematic Review

CONTEXT

Children in care of the child welfare system tend to underutilize preventive health services compared with other children. The purpose of this systematic review was to assess current knowledge regarding immunization coverage levels for children in the child welfare system and to determine barriers and supports to them utilizing immunization services.

EVIDENCE ACQUISITION

Articles published in Medline, Embase, Cochrane Library, CINAHL, SocINDEX, and ERIC from January 1, 2000 to October 13, 2017 were searched. Thesis and conference databases and relevant websites were also examined. Studies were included if written in English, from high-income countries, and addressed immunizations for children in the child welfare system. Independent dual screening, extraction, and quality appraisal were conducted between October 2016 and December 2017, followed by narrative synthesis.

EVIDENCE SYNTHESIS

Of 2,906 records identified, 33 met inclusion criteria: 21 studied coverage, two studied barriers/supports, and ten studied both. Nineteen studies were moderate or high quality and thus included in the narrative synthesis; 15 studied coverage, one studied barriers/supports, and three studied both. Most studies found lower coverage among children in child welfare. The few studies that explicitly studied barriers/supports to immunization identified that a collaborative and coordinated approach between health and social services was key to service delivery to this population.

CONCLUSIONS

This review highlights that children in care of the child welfare system are at risk of poor immunization coverage. There is a need for high-quality studies on this issue, with a focus on assessing supports/barriers to immunization in this population.

Vaccine coverage of children in care of the child welfare system

OBJECTIVE

To assess vaccine coverage for a cohort of children who have been in the care of the child welfare system compared to children in the general population.

METHODS

This retrospective cohort study used population-based administrative health data for a 2008 birth cohort of children from Alberta, Canada. We assessed coverage at ages 2 (n = 44,206) and 7 (n = 42,241) for three vaccines with different administration schedules for children in care (at any period before the age of assessment) and those who had never been in care, comparing them using risk differences and relative risks (RRs). We similarly assessed coverage for children not in care who shared characteristics of children in care.

RESULTS

At age two, vaccination coverage for children in care ranged from 54.3% to 81.4%, depending on vaccine. In comparison, coverage for those not in care ranged from 74.2% to 87.4%. At age seven, coverage for children in care ranged from 53.1% to 65.3%, compared to 76.6% to 83.4% for those not in care. For all vaccines at both ages, the risk for being under-vaccinated was higher for children in care (e.g., diphtheria, pertussis, tetanus, polio, Haemophilus influenzae type b at age 7: RR 2.01, 95% confidence interval [CI] (1.74-2.32). Even for children not in care who had characteristics similar to children in care, we found children in care had lower coverage.

CONCLUSION

Children in care have consistently lower vaccine coverage than children not in care. Policies and practices should promote optimal access to vaccination for these children.

Is underimmunization associated with child maltreatment?

OBJECTIVE

To assess the relationship between underimmunization and child maltreatment among children referred to a child advocacy center for a child maltreatment evaluation.

METHODS

We conducted a secondary data analysis of 399 children aged 3 to 48 months who were referred to a child advocacy center at an academic medical center. The primary independent variable was age-appropriate immunization status. The dependent variable was maltreatment (confirmed, suspected, or ruled out). Multivariate models were used to control for insurance, race/ethnicity, and maternal education.

RESULTS

At 3 and 7 months of age, underimmunized children were significantly more likely to have confirmed maltreatment than children whose immunizations were up to date (at 3 months, 32.0% vs 17.6%, P < .05; at 7 months, 23.7% vs 8.6%, P < .01). At 19 months, rates were not significantly different (16.1% vs 24.1%, P = .33). In multivariate analyses, children underimmunized at 3 or 7 months of age were 4 times more likely to have confirmed maltreatment compared with children whose immunizations were up to date (at 3 months, adjusted odds ratio [AOR], 3.97, 95% confidence interval [95% CI], 1.67-9.49; at 7 months, AOR, 4.79, 95% CI, 1.47-15.66). This relationship was statistically significant for children evaluated for physical abuse (AOR, 4.34, 95% CI, 1.18-16.02), but not for sexual abuse.

CONCLUSIONS

Underimmunization at 3 and 7 months of age was associated with confirmed maltreatment, specifically physical abuse, in children evaluated for child maltreatment. The association between underimmunization and child abuse in the general population deserves further study.

Is there a relationship between lacking a primary care provider and child abuse?

OBJECTIVE

To examine the association between lacking a primary care provider and child abuse.

METHODS

We conducted a secondary data analysis of 1462 children aged </=19 years presenting for suspected physical/sexual abuse to a child advocacy center (CAC) at an academic medical center. Children were stratified by age. The key independent variable was having a primary care provider. The dependent variable was abuse: confirmed, suspected, or ruled out. Multivariate models were adjusted for sociodemographic factors and referral source.

RESULTS

Children aged </=2 years without a primary care provider were more than 4 times as likely to have confirmed/suspected abuse of either type, compared with children with a provider, after adjusting for sociodemographic factors (adjusted odds ratio: 4.41; 95% confidence interval, 1.38-14.13). This relationship was also significant when looking only at children evaluated for physical abuse, but not for children evaluated for sexual abuse. Although there continued to be an association between lacking a provider and abuse, especially physical abuse, for children </=2.5 years of age there was no association after this age. For sexual abuse, there was no association between lacking a primary care provider and sexual abuse for children of any age.

CONCLUSIONS

Among young children aged </=2.5 years presenting to a CAC, we found an association between lacking a primary care provider and child abuse, particularly physical abuse. The significance of this association deserves further study.

Immunization coverage and its determinants in children aged 12–23 months in Gansu, China

The study aimed to assess the determinants of immunization coverage in 12-23-month-old children born in 1997 and living in Gansu Province in West China. The World Health Organization's cluster sampling technique was used. Information was gathered by face-to-face interviews with caregivers and from immunization records. Bacille Calmette Guerin (BCG), Polio and Diphtheria, Tetanus, Pertussis (DTP) coverage at 3 months was 51.2%. At 8 and 12 months, including the Measles Vaccine, coverage was 71.3 and 86.0%, respectively. The variables associated with delay at 12 months were: low socio-economic level, low number of sources of information on vaccination and delayed immunization at 3 months. Improved immunization coverage could be achieved by improving access and delivery to poor and remote areas and by awarding incentives to providers at primary care level.