Endothelial damage is associated with CD14⁺ or NK populations. (A) Endothelial damage by CMV antigen–stimulated PBMC subset populations shows NK and CD14⁺ monocyte-macrophage populations associated with damage after 5 days of coculture. Negative controls without CMV antigen stimulation are indicated. (B) Endothelial damage assays per subset populations in which results were quantitated by counting remaining endothelial cells per field of view (FOV) under the microscope (20× objective). Results are representative of 3 independent assays, each with different CMV-seropositive donors. Error bars represent SD.