DR KARI LOUNATMAA / SCIENCE PHOTO LIBRARY DR KARI LOUNATMAA / SCIENCE PHOTO LIBRARY
Herpes simplex virus. Coloured transmission electron micrograph (TEM) of a herpes simplex virus particle (green), cause of herpes simplex. The viral particle consists of a protein shell or capsid, enclosed by a lipoprotein membrane. The capsid is icosahedral (20-sided) and is made up of 162 protein units. It encloses the genetic material deoxyribonucleic acid (DNA). Infection causes the eruption of small blisters on the skin and mucosal surfaces, and it is spread by direct contact. The virus can remain dormant within the host tissue, reactivating at a later date. Magnification: x480,000 at 6.5x9.5 inch size.
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