False-colour transmission electron micrograph (TEM) of virions (virus particles, orange) of the herpes simplex virus. Here, the viruses are migrating from the host cell's nucleus (green) into surrounding cytoplasm (blue, at top). Herpes simplex is a common parasite of man, causing a variety of infections, including whitlows and cold sores of mouth & genitalia. Genital herpes, attributed to Herpes simplex type 2 virus, is one of the sexually-transmitted diseases least amenable to treatment, and has been implicated in the development of cancer of the cervix in women. Magnification: x75,500 at 35mm, x190,000 at 6x7cm size.