SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Not for use in Television.
Close up of the cheek of a young boy with a cold sore. This is caused by herpes simplex viral infection. Two types of herpes simplex have been distinguished: Type 1 (HSV-1) and Type 2 (HSV-2). HSV-1 infection commonly occurs in childhood. After the primary infection, the virus persists in a latent state to re-appear and cause recurrent cold sores.
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