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Most physicians whose practice includes the diagnosis and treatment of common nematode diseases are probably unaware that the roundworm parasites of man and domestic animals comprise only a small segment of the total species of nematodes in the world. By far the largest number are free-living, in soil and freshwater. Some are distant kin to the trichina worm (Trichinella spiralis) and the whipworm (Trichocephalus trichiurus); others are more nearly related to Strongyloides and the hookworms. Certain free-living nematodes, for example, species of Rhabditis, Rhabditiella, Turbatrix (the "vinegar eel"), Ditylenchus (the "onion bulb nematode"), and Heterodera (the "root-knot nematodes") have been found as contaminations of human feces, urine, or even skin lesions, and thus require diagnostic differentiation to eliminate them as potential agents of human disease.
The author of this monograph is one of the few world authorities in his field. He has provided the first up-to-date comprehensive manual on the
Soil and Freshwater Nematodes: A Monograph. JAMA. 1951;146(11):1085–1086. doi:10.1001/jama.1951.03670110105039
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