Zostavax, a vaccine to prevent shingles, has recently been approved by the FDA and reviewed by The Medical Letter. Shingles (also called herpes zoster) is a very painful illness involving blisters that occur in a stripe-like pattern on one side of the body.  Shingles can only happen in people who have had chicken pox.  The virus that causes chicken pox, varicella zoster virus (VZV), stays in the in sensory nerve cells of the infect...