Herpes virus particle, coloured transmission electron micrograph (TEM). Each particle (virion) consists of a deoxyribonucleic acid (DNA) genome surrounded by an icosahedral capsid (purple/white), which is itself surrounded by an envelope covered in glycoprotein spikes (not seen). Members of the herpes virus family include several that infect humans: herpes simplex viruses type 1 and type 2 (oral and genital herpes), varicella-zoster virus (chicken pox and shingles), Epstein-Barr virus (glandular fever) and cytomegalovirus (various infections). Magnification: x214,000 when printed 10 centimetres high.