Human Herpes Virus type 6. Coloured Transmission Electron Micrograph of Human Herpes Virus type 6 (HHV6) outside a human cell. Several circular virus particles are seen in cross section with the cell membrane at top right (brown). Each virus has a core of DNA-genetic material (red) covered by a protein capsid (green). This is surrounded by a yellow tegument made of fats and proteins. These viruses reproduce by instaking overins the infected cell, making it produce new viruses. HHV6 causes the childhood disease roseola infantum leading to fever and rash. It is also seen as a secondary & opportunistic infection in AIDS patients.