Why has my child developed chicken pox even though he/she has had the Varicella immunization?
While it was thought that one dose of varicella vaccine would be sufficient to protect against chicken pox, we are seeing break through cases indicating that the immunity level is not optimal. The break through disease that is being seen is a mild case of chicken pox. As a result, at this time it is recommended that your child receive a second dose of Varicella vaccine to boost the immunity and offer better protection against chicken pox.