You can get shingles twice.
More Info: Shingles is caused by the varicella-zoster virus, the same virus that causes chicken pox. Once an individual has had the chicken pox the virus will go dormant in the body. If it reawakens, it will cause shingles the second time around.
Though past research does suggest that the varicella-zoster virus very rarely causes shingles in the same individual more than once (past research places the incident rate at between one to five percent), new research is emerging that is suggesting the occurrence to be more commonplace. For example a recent study conducted by researchers at the Olmstead Medical Center concluded that the recurrence is comparable to the rates of the first occurrence.
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Yawn , BP, PC Wollan, and MJ Kurland. “Herpes zoster recurrences more frequent than previously reported.” Mayo Clinic Proceedings 86.2 (2011): 88-93. Print.
“Shingles: A Second Strike by the Chickenpox Virus.” University of Rochester Medical Center. N.p., n.d. Web. 14 Nov. 2011. <www.urmc.rochester.edu/encyclopedia/content.aspx?ContentTypeID=1&ContentID=19956>.