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There is a possibility of reactivation of shingles in patients undergoing chemotherapy as a result of the immunocompromised state of cancer patients. After each chemotherapy session, the blood counts are "down", usually with anemia and neutroprenia. But the blood counts usually recover before the next cycle of chemotherapy.
It would be best to bring your wife back to her oncologist. Depending on the evaluation, there may be a need to give treatment for shingles and possibly delay the next chemotherapy session until the shingles resolve.
Hope this helps.