In a recent study, researchers reviewed the incidences of complications of chicken pox since the vaccine use has become widespread. Although rare, there were cases of brain inflammation (encephalitis) and seizures with resulting permanent neurological damage with the disease; these do not seem to occur with the vaccine. As well, especially in adults, there were severe and often life threatening complications such as blood infections (sepsis), pneumonia, joint and bone infections and bleeding.
Furthermore, in people whose immunity is suppressed, chicken pox can be fatal. This includes HIV patients as well as many people undergoing treatment for cancer.
Based on our current knowledge, the vaccine for chicken pox (also known as varicella) is safer than getting the disease and spreading it.
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