bild

Coloured transmission electron micrograph (TEM) of a herpes simplex virus (HSV) particle. This virus infects humans, causing herpes. Herpes is a common, chronic infection. It is mostly symptomless, but can cause ulceration of the skin, especially around the lips and genitals. Medication is available to reduce symptoms, but there is no cure. (KEYSTONE/SCIENCE PHOTO LIBRARY/NIAID)