Herpes zoster in older adults.

Herpes zoster (HZ) is a common condition among older adults, manifested by pain and the classic presentation of a unilateral rash that follows a dermatomal distribution and does not cross the midline of the body. It is caused by reactivation of the virus that caused chickenpox during an earlier infection. In many cases, acute HZ is followed by a severe and disabling complication known as postherpetic neuralgia (PHN), characterized by pain that persists for months or even years after the HZ rash heals. Using an individual example, this article provides information on the clinical manifestations, evidence-based treatment recommendations for, and prevention of HZ and PHN through use of the zoster vaccine Zostavax, licensed in the United States in 2006.