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Risk factors for underimmunization in poor urban infants
A S Bates1, J F Fitzgerald, R S Dittus
1Indiana University School of Medicine, Regenstrief Institute for Health Care, Indianapolis 46202.
JAMA
|October 12, 1994
Summary
Many poor urban infants remain underimmunized, even with free vaccines. Factors like single motherhood, inadequate prenatal care, and living without a grandmother predict low immunization rates, requiring targeted follow-up.
Area of Science:
- Pediatrics
- Public Health
- Epidemiology
Background:
- Underimmunization remains a significant public health concern, particularly in urban, low-income populations.
- Identifying specific risk factors is crucial for developing effective intervention strategies to improve childhood vaccination rates.
Purpose of the Study:
- To identify risk factors associated with underimmunization in impoverished urban infants.
- To assess the effectiveness of free vaccine availability in achieving adequate immunization coverage.
Main Methods:
- Prospective cohort study involving 464 healthy, full-term newborn infants.
- Mothers were interviewed postpartum and 9-12 months later regarding sociodemographic factors and immunization status.
- Immunization status was assessed at 3 and 7 months of age.
Main Results:
- Only 67% of infants received their first immunizations by 3 months, and 29% were up-to-date by 7 months, despite free vaccine availability.
- Significant predictors of underimmunization included single maternal marital status, not living with the infant's grandmother, inadequate prenatal care, and perceived barriers to care.
- Poverty and lower perceived susceptibility to illness or benefit of medical care were also associated with lower immunization rates.
Conclusions:
- Free vaccine provision alone is insufficient to ensure adequate immunization coverage in poor urban children.
- Targeted tracking and follow-up programs are recommended for high-risk infants, including those of single mothers, mothers with inadequate prenatal care, and those not living with their grandmother.