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A NEWLY RECOGNIZED CAUSE OF PULMONARY DISEASE—ASCARIS LUMBRICOIDES

1919; American Medical Association; Volume: 73; Issue: 16 Linguagem: Inglês

10.1001/jama.1919.02610420038013

2376-8118

B. H. Ransom,

Parasites and Host Interactions

It has long been known that the common roundworm of man ( Ascaris lumbricoides ) and the closely related and probably identical parasite of the pig ( Ascaris suum ) sometimes occur aberrantly in organs other than the small intestine, their usual location. Until the recent investigations of Stewart, 1 however, the fact that Ascaris is regularly parasitic in the lungs during an early stage of its development was not even suspected. Stewart's experiments have been repeated by Yoshida 2 and by Foster and myself, 3 and Stewart's important discovery that the larvae of Ascaris , after hatching in the intestine of an animal that swallows the eggs, migrate to the lungs and then return to the intestine, has been fully confirmed. With reference to the rat and mouse theory, however, Foster and I have reached conclusions that are not in accord with Stewart's view that rats and mice may serve as intermediate hosts of