VOLKER STEGER / CDC / SCIENCE PHOTO LIBRARY VOLKER STEGER / CDC / SCIENCE PHOTO LIBRARY
Herpes simplex viruses. Coloured transmission electron micrograph (TEM) of a section through Herpes simplex viruses, the cause of oral cold sores and genital herpes. The genetic material of each virus is held in a core (magenta) which is surrounded by a protein coat (capsid, green). Herpes simplex is one of the most common viruses to infect humans. It causes small fluid-filled blisters which, if touched, can spread the virus. In the mouth the blisters may persist for weeks. Antiviral drugs may help in the treatment of the condition. Magnification: x15,000 at 35mm size.
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