DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Cold sores on lips (herpes simplex type 1 infection) in a 39-year-old woman. The infection is contagious and spreads by direct contact with the blisters or their fluid. There are two types of herpes simplex virus, with HSV1 causing infections of the nose, mouth and face.
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