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Cell infected with herpes virus. Coloured scanning electron micrograph (SEM) of herpes simplex virus-1 (HSV-1) particles (spherical) being released from a host cell. This virus infects epithelial cells around the mouth, causing fluid-filled blisters known as cold sores. There is no known cure for herpes infection and the virus remains in the body for life. Magnification: x11,200 when printed at 10 centimetres tall.
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