A disease caused by infection with parasitic roundworms of the genus Ascaris, usually contracted through contaminated food or water.
From ascaris (a parasitic roundworm) plus the suffix -iasis (medical condition or disease). This medical terminology became standard in the 19th century as parasitology developed as a scientific field.
Ascariasis still affects about a billion people worldwide, mostly in areas without good sanitation—it's one of the most common parasitic infections in humans, even though many people in developed countries have never heard of it!
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