Dictionary of Tropical Medicine

Xenodiagnosis

A method used in the diagnosis of Chagas Disease (South American Trypanosomiasis), in which vector reduviid bugs are allowed to suck the blood from patients suspected of having the infection. The insects are subsequently examined for the presence of trypanosomes in their gut to confirm infection.

Xerophthalmia

This is a blinding eye disease, almost exclusively of infants and young children, which results from vitamin A deficiency, associated with protein-calorie-malnutrition. Xerophthalmia literally means 'dryness' of the conjunctiva.