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Development of an IFN-γ ELISpot Assay to Assess Varicella-Zoster Virus-specific Cell-mediated Immunity Following Umbilical Cord Blood Transplantation

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Towards universal childhood immunization against chickenpox?

¹Department of Pediatrics and Child Health, University of Manitoba and Winnipeg Hospital, Winnipeg, Manitoba.

Paediatrics & Child Health

|February 24, 2010

Summary

Varicella vaccine offers significant protection against chickenpox, reducing severe illness and reactivation. Despite concerns, childhood immunization is crucial for population health, as children account for most hospitalizations and fatalities.

Keywords:

Chickenpox Shingles Vaccine Varicella zoster

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Area of Science:

Immunology
Vaccinology
Public Health

Background:

Live attenuated varicella vaccine is available in Canada, with recommendations for immunization.
Universal childhood immunization is limited to Prince Edward Island.
Barriers include perceptions of chickenpox severity, vaccine effectiveness concerns, and waning immunity fears.

Purpose of the Study:

To assess the benefits of varicella immunization.
To compare the natural history of chickenpox with vaccine effectiveness.
To address concerns regarding vaccine efficacy and long-term effects.

Main Methods:

Comparative analysis of disease natural history and vaccine effectiveness data.
Review of clinical trial data and population-based disease burden statistics.
Evaluation of risks associated with natural varicella infection versus vaccination.

Main Results:

Chickenpox is often mild but causes significant hospitalizations and fatalities in children.
Vaccine effectiveness ranges from 70-86% against any chickenpox and 95-100% against severe illness.
Vaccination significantly reduces the frequency and severity of reactivation illness.

Conclusions:

Varicella immunization is beneficial for both individual and public health.
The vaccine effectively mitigates severe disease and reactivation episodes.
Addressing barriers is essential for achieving high childhood vaccine coverage.