CMV-specific IFNγ positive T-cell response in KT patients. CMV-lysate-specific interferon-γ responses in CMV-seropositive R(+) patients and CMV-seronegative D(+)R(-) KT patients. Black bars indicate median, whiskers indicate interquartile range. P-values were calculated using Mann-Whitney U test. Note: The median was below the analytical cut-off of 0.01% in the CMV-seronegative D(+)R(-) KT patients.