DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Phlyctenulosis. Close-up of the bloodshot eye of an 8-year-old girl with phlyctenulosis (phlyctenular keratoconjunctivitis). This inflammatory syndrome is caused by a delayed hypersensitivity reaction to one or more antigens. The triggering antigen is usually a bacterial protein (particularly from Staphylococcus aureus), but may also be a virus, fungus (particularly Candida albicans), or nematode parasite.
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