Approximately 5% of children who receive the vaccine develop a fever or rash. Adverse reaction reports for the period 1995 to 2005 found no deaths attributed to the vaccine despite approximately 55.7 million doses being delivered.Cases of vaccine-related chickenpox have been reported in patients with a weakened immune system, but no deaths.
The literature contains several reports of adverse reactions following varicella vaccination, including vaccine-strain zoster in children and adults. A mean of 2,350 reports per year of an adverse event the occurs some time after varicella vaccine is administered, based on 20,004 cases reported to the Vaccine Adverse Event Reporting System (VAERS) database from May 1995 through December 2003; however, this includes all adverse events, whether or not caused by the vaccine.
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