ASCARIS LUMBRICOIDES

A parasite belonging to the genus entozoa , commonly known as the round worm, and found in the intestines of man, the horse, the ox, the pig, and some other of the lower animals. It is of a greyish-red colour and in size and general appearance like the common earthworm. Children are very frequently infested by them. Their usual habitat is the small intestines. But they are occasionally found in the stomach, and have been known to transport themselves into the gall-ducts, frontal sinuses, nostrils, and mouth. The males are smaller than the females and much more rare. The females produce eggs in great numbers, but it is doubtful if the young are ever developed in the intestine in which the parent worm dwells. It is probable that the ova gain acce to the intestines of the animals of which they eventually become the pests from various outer sources. They are said to be very frequent in persons who partake much of raw leaves and roots. Dr Paters on, of Leith, noticed that families who drank certain water from a well supplied from a dirty pool, which contained various vermiform animalcules, were much infested with this particular species of intestinal worm; whilst others in the same street, who had recourse to a different water supply, entirely escaped. For medicinal treatment, see Worms .