ScienceDaily (Feb. 1, 2011) — For decades, medical wisdom about shingles has been that it's a once-in-a-lifetime experience. The commonly-held belief is that patients are protected from a recurrence of the herpes zoster virus, which causes shingles, after one episode. But according to a study published in the February issue of Mayo Clinic Proceedings, recurrences of shingles may be significantly more common than doctors have suspected.
http://www.sciencedaily.com/releases/2011/02/110201122536.htm