Controversy
Mortality due to primary varicella has declined significantly in countries which make wide use of the varicella vaccine. Zoster (shingles) most often occurs in the elderly. Multiple studies have not observed any effect on zoster incidence. This may be because infants and children immunized in varicella vaccination programs have not yet reached the age where zoster typically occurs. It is likewise too early to observe the effect on postherpetic neuralgia (PHN).
It has been claimed that adult shingles may increase after introduction of varicella vaccine.
Additional controversy has arisen because cell lines derived from aborted fetal tissue were used in its development, and thus violates the ethics and beliefs of people who oppose the use of aborted fetal tissue in medical research.
Read more about this topic: Varicella Vaccine
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