Electron micrographs of infected cells. A. K6 cell infected with HHV-6 (arrows) with margination of the chromatin in the nucleus and extensive vascularization. B. K2 cell showing HIV-1 particles (arrows). It is unclear whether the particles are outside the cell or in a vacuole inside the cell. C. K5 cell showing partial HCV particles inside a vacuole (arrow). D. K6 cell showing HCV particles (arrows). E. Inset showing HCV from Figure 4D.