The usually accepted conception of the origin of ascariasis, or eelworm infection, in man and the pig attributes it to ingestion of the egg of the parasite Ascaris lumbricoides. Stiles1 stated ten years ago that the eggs escape in the feces, and slowly (in from one to several months, according to conditions) develop embryos. No intermediate host is believed to be required, at least for Ascaris lumbricoides or the canine eelworm Toxocara canis, as it is in the case of certain other well known zooparasitic infections. It was maintained that when the developed eggs are swallowed, either in contaminated food or in water, or from hands soiled with dirt containing the eggs, the embryo develops directly to the adult stage. Drinking water and fruits, especially, are blamed for carrying the parasite to man. Stiles states that he has bred common house-flies in a dish containing eggs of the eelworm
INFECTION WITH THE ROUNDWORM ASCARIS. JAMA. 1918;70(7):460–461. doi:https://doi.org/10.1001/jama.1918.02600070034011
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