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Children should get second dose of chickenpox vaccine

Infection Control Monitor, March 16, 2007

The vaccine used in the United States to inoculate children against varicella or chickenpox weakens over time, possibly leaving them vulnerable to contracting the disease as an adult when the risk of serious complications may be greater, a new study found.

 

The varicella vaccine starts to lose its potency after five years, according to the study published March 15 in the New England Journal of Medicine. The study concluded that a second dose of vaccine for all children, recommended by the Centers for Disease Control and Prevention in June, could improve protection from both primary vaccine failure and waning vaccine-induced immunity.

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