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Immunization recall: effectiveness and barriers to success in an urban teaching clinic
A Kempe1, N E Lowery, K A Pearson
1The Children's Hospital, Denver, CO 80218, USA.
Insights
Immunization recall efforts showed partial success in urban pediatric clinics, improving vaccination rates in 12-month-olds. However, barriers like poor contact and documentation limited overall effectiveness.
Area of Science:
- Pediatric Public Health
- Preventive Medicine
- Health Services Research
Background:
- Ensuring children are up to date (UTD) with immunizations is crucial for public health.
- Targeted interventions are needed to improve vaccination coverage in urban pediatric settings.
- Identifying barriers to effective immunization recall is essential for optimizing childhood vaccination programs.
Purpose of the Study:
- To evaluate the effectiveness of a mailed postcard and telephone call recall strategy for childhood immunizations.
- To identify specific barriers hindering the success of immunization recall interventions in a pediatric clinic.
- To assess the impact of recall on immunization status, healthcare visits, and missed opportunities.
Main Methods:
- A randomized controlled trial was conducted with children aged 5 to 17 months not up to date (UTD) on immunizations.
- The intervention group (n=294) received mailed postcards and up to four phone calls; the control group (n=309) did not.
- Outcomes assessed after two months included UTD status, visit rates, and probable missed immunization opportunities.
Main Results:
- A trend towards higher UTD rates was observed in 12-month-olds in the intervention group (51% vs 39%, P=.07).
- The intervention group showed a significantly higher proportion of children receiving immunizations versus improved documentation (25% vs 10%, P=.005).
- Children in the intervention group had more health maintenance visits (17% vs 11%, P=.03), but significant barriers to recall were noted, including 30% unreachable participants.
Conclusions:
- Immunization recall efforts demonstrated partial success, particularly in increasing vaccination uptake among 12-month-olds.
- Barriers such as difficulty reaching the target population, inadequate immunization documentation, and missed opportunities during illness visits impeded recall effectiveness.
- Strategies to overcome these barriers are necessary to enhance the impact of future immunization recall initiatives.
Objective:
To examine effectiveness of immunization recall in an urban pediatric teaching clinic and to identify barriers to recall effectiveness.
Design:
Randomized, controlled trial. Children aged 5 to 17 months who were not up to date (UTD) with recommended immunizations were identified and assigned to intervention (n = 294) or control groups (n = 309). The intervention consisted of a mailed postcard and up to 4 telephone calls. Two months after intervention, UTD status, visit, and probable missed opportunity rates were assessed.
Results:
Of the intervention group, 30% could not be reached. In 12-month-old children in the intervention group compared with those in the control group, there was a trend toward higher UTD rates (51% vs 39%, P =.07) and a higher proportion of UTD children receiving immunizations as opposed to getting more complete documentation (25% vs 10%, P =.005). Similar differences between intervention and control children were not seen in the 7-month and 19-month age categories. More children in the intervention group had a health maintenance visit (17% vs 11%, P =.03). Of children in the intervention group who were seen when not UTD, 17 of 24 (71%) of those seen for an illness visit and 5 of 24 (21%) of those seen for health maintenance probably had missed opportunities to be immunized.
Conclusions:
Recall efforts were partially successful but were undermined by inability to reach the clinic population, poor documentation of immunizations, and missed opportunities.