This study will evaluate whether a test for Cytomegalovirus (CMV) specific cell-mediated immunity can be used to determine whether patients who complete a course of therapy for CMV viremia need secondary antiviral prophylaxis. Subjects that have negative CMV CMI will receive antiviral prophylaxis for 2 months and those with positive CMV CMI will have their prophylaxis stopped.
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Virologic recurrence or disease recurrence
Timeframe: 6 months