Herpes simplex virus. Coloured transmission electron micrograph (TEM) of a herpes simplex type I virus. The virus has an icosahedral capsid (protein coat, yellow) surrounding a core of DNA (deoxyribonucleic acid) genetic material. Herpes simplex type I is associated with oral cold sores. Herpes simplex is one of the most common viral parasites in humans. They cause small, fluid-filled blisters which may persist for weeks and, if touched, can spread the virus. Antiviral drugs may be helpful. Negatively stained. Magnification unknown.
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