Postherpetic neuralgia in shingles
Complications, including postherpetic neuralgia (PHN) occur in ~50% of older persons with shingles.
Oxman, M.N., M.J. Levin, G.R. Johnson, K.E. Schmader, S.E. Straus, et al; for the Shingles Prevention Study Group. A Vaccine to Prevent Herpes Zoster and Postherpetic Neuralgia in Older Adults. NEJM. 2005; 352(22): 2271-84. http://www.nejm.org/doi/full/10.1056/NEJMoa051016