Breakthrough varicella is defined as onset of the chickenpox (varicella) even after the individual has been vaccinated against it. In order to be classified as breakthrough varicella, disease will have developed between 42 days to 5 years post-vaccination. The symptoms associated are less severe than chickenpox; with little or no fever and only around 50 skin lesions that are maculopapular in nature, that is, a rash comprised of small red bumps instead of pustules and lesions. That said 25% of patients will experience breakthrough varicella symtpoms that are similar to chickenpox.
More information on Chickenpox
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