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When and why children fall behind with vaccinations: missed visits and missed opportunities at milestone ages

Elizabeth T Luman1, Susan Y Chu

  • 1National Center for Immunization and Respiratory Diseases, CDC, Atlanta, Georgia 30333, USA. ECL7@cdc.gov

American Journal of Preventive Medicine
|December 9, 2008
PubMed

Insights

Many children fall behind on vaccinations due to missed visits and missed opportunities for simultaneous vaccines. The 7-16 month interval is critical, with over 90% of delays caused by missed opportunities for timely childhood immunizations.

Area of Science:

  • Pediatrics
  • Public Health
  • Immunization Practices

Background:

  • Childhood vaccination schedules are crucial for disease prevention.
  • Understanding attrition in vaccination status is vital for public health initiatives.

Purpose of the Study:

  • To identify critical periods when children fall behind on recommended vaccinations.
  • To differentiate between missed vaccination visits and missed opportunities for simultaneous vaccination as causes of delay.

Main Methods:

  • Analysis of vaccination histories for 27,083 children aged 24-35 months using 2006-2007 National Immunization Survey data.
  • Assessment of vaccination status at key milestone ages (3, 5, 7, 16, 19, 24 months).
  • Quantification of attrition between milestones and its causes (missed visits vs. missed opportunities).

Main Results:

  • Between 9% and 20% of children fell behind vaccination milestones.
  • Missed vaccination visits were the primary cause of delay from 3-7 months and 16-19 months.
  • Missed opportunities for simultaneous vaccination accounted for over 90% of delays between 7 and 16 months of age.

Conclusions:

  • Addressing both missed vaccination visits and missed opportunities for simultaneous vaccination is necessary to improve childhood immunization rates.
  • The 7-16 month interval requires focused attention, as it's a key period for missed opportunities for timely vaccinations.
  • Healthcare providers should prioritize delivering all due vaccinations during this critical developmental stage.
Abstract

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