All the info you need about Shingles.
http://www.cdc.gov/mmwr/preview/mmwrhtml/rr5705a1.htmContradictions and Precautions for Commonly Used Vaccination in adults.
http://www.immunize.org/catg.d/p3072.pdfZoster (HZV) Contradictions: "Known severe immunocompromised deficiency (e.g. from hematologic and solid rumors, receipt of chemotherapy, and long-term immunosuppressive therapy and patients with HIV infection who are severely immunocompromised."
For those that like to read, ACIP, "Advisory Committee on Immunization Practices"
http://www.cdc.gov/mmwr/pdf/wk/mm62e0128.pdf