The FDA has approved Merck’s vaccine Zostavax for prevention of herpes zoster (shingles) in individuals 60 years of age and older. Shingles is a frequently painful disease marked by a blistering rash. Caused by the reactivation of the virus that causes chickenpox, shingles can lead to severe complications including long-term nerve pain, which can last for months or even years. Zostavax is not a treatment for shingles or postherpetic neuralgia. Anyone who has been infected with chick...