Impact of Varicella Vaccine Shortage on Children's Immunization Rates
Author Information
Author(s): Yawn Barbara P, Schroeder Clayton, Wollan Peter, Rocca Liliana, Zimmerman Rick, Bardenheier Barbara
Primary Institution: Olmsted Medical Center
Hypothesis
What is the impact of the varicella vaccine shortage on immunization rates in children aged 18 and 24 months?
Conclusion
The varicella shortage caused a temporary drop in immunization rates, but these rates rebounded to above pre-shortage levels.
Supporting Evidence
- The varicella immunization rate fell from 79.7% pre-shortage to 77.2% during the shortage.
- Post-shortage, the immunization rate increased to 84.0%.
- MMR immunization rates remained stable at 87% throughout the study.
Takeaway
When there wasn't enough varicella vaccine, fewer kids got their shots, but after the shortage ended, more kids got vaccinated than before.
Methodology
The study analyzed immunization records of children in three birth cohorts before, during, and after the varicella vaccine shortage.
Potential Biases
The reliance on medical records may introduce bias if records were incomplete or inaccurate.
Limitations
The study may not account for vaccinations received outside the county, potentially underestimating the vaccination rate.
Participant Demographics
The population was predominantly Caucasian, with 65% white non-Hispanic, 5% Hispanic, 18% African or Black, and 12% Asian.
Statistical Information
P-Value
0.04
Statistical Significance
p < 0.05
Digital Object Identifier (DOI)
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