DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Viral conjunctivitis of the left eye of a 6-year-old boy. The eye is bloodshot with a watery discharge. These symptoms are caused by a viral infection of the conjunctiva. This is the membrane lining the inside of the eyelids and covering the exposed part of the eyeball. Viral conjunctivitis can spread rapidly in a population, causing an epidemic. It can be triggered by a cold or sore throat, or another viral illness. There is no specific cure, and it usually clears up without treatment.
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