Many different infections can cause Parinaud's syndrome, including bacteria, viruses, fungi and parasites. The most common causes are tularemia (rabbit fever) and cat-scratch fever. Tularemia can infect the eye either by direct inoculation of the bacteria into the eye (by a finger or other object) or via aerosolization of the bacteria into the air, which then land on the eye. Other infectious diseases can spread both by these mechanisms and also through the bloodstream to the eye.
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