RENBP and cytomegalovirus infection: In a study of CMV-seropositive heart transplant recipients, a higher proportion of patients with an indeterminate QF-CMV result (QF-Ag < 0.2 IU/ml and QF-Mg < 0.5 IU/ml) after the suspension of prophylaxis developed a post-transplant CMV infection compared to patients who showed a global T-cell responsiveness (53).