DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Herpes simplex lesions on the buttock of a five- year-old girl. Herpes simplex is a viral infection, regarded as being the most common human viral parasite. This is a Type 1 (HSV-1) infection, which 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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