This brief definitive review of herpes zoster (HZ) will cover the current state of knowledge and questions that remain to be answered regarding HZ in general and HZ ophthalmicus in particular. A question-and-answer format will be used to address various important topics related to this common and serious disease. Questions to be addressed relate to common misconceptions, contagiousness of infection, unknowns regarding pathogenesis, rising incidence, risk factors and complications, relationship with temporal arteritis, vaccination, and current and future antiviral treatment. In addition, the importance of the Zoster Eye Disease Study to determine the efficacy of suppressive valacyclovir treatment in preventing complications of HZ ophthalmicus and the need to support enrollment will be discussed.
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