Parasites of swine / Maurice C. Hall.

  • Hall, Maurice C. (Maurice Crowther), 1881-1938.
Date:
[1924], ©1924
Catalogue details

Licence: Public Domain Mark

Credit: Parasites of swine / Maurice C. Hall. Source: Wellcome Collection.

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    examined post mortem by him whipworms were present in the young shoats, but not in the older pigs. Treatment.—Uncertain. It would probably require repeated treat¬ ments with some such non-irritant drugs as santonin for a number of consecutive days or a massive dose of some relatively non-toxic drug to remove these worms. Occasional worms may be removed by a single dose of the usual anthelmintics. Prophylaxis.—Sanitation, such as that recommended for the con¬ trol of swine ascarids, is indicated as a control measure (See page 60). TRICHURIS OVIS (Abildgaard, 1795) A. J. Smith, 1908 The whipworm of ruminants Synonyms.—See Parasites of Sheep. Hosts.—Swine and, commonly, cattle, sheep, goats, etc. This worm is occasionally reported from swine. It is still questionable as to whether the worms found belong to this species or to TV. suis (Page 131). Location.—Cecum and colon. Morphology, life history, etc.—-See Parasites of Sheep. This worm resembles TV. suis in a general way. It is not of known importance in connection with swine. TRICHINELLA SPIRALIS (Owen, 1835) Railliet, 1895 Trichina Synonym.—Trichina spiralis Owen, 1835. Hosts.—Primary: Swine, rat and man, and, less often, various other animals; secondary: The same, the worm passing its larval stage, as well as its adult stage, in the same host animal. Location.— In the small intestine as adults; in the voluntary mus¬ culature as larvae. Morphology.—Trichinclla: Minute worms of nearly uniform diam¬ eter throughout, but slightly thicker posteriorly. The round head has an unarmed mouth opening into the tubular portion of the esophagus, which after a short course is imbedded in the single layer of cells pres¬ ent in this and related forms. At the posterior end of the esophagus are 2 appendices. The anus is terminal. Male 1.4 to 1.5 mm. long by 40^ thick (Fig. 114). The terminal portion of the vesicula seminalis and the cloaca can be extruded in copulation (Fig. 115). Two conical projections on each side of the cloaca, with 4 papillae behind them (Fig. 116). Female 3 to 4 mm. long by 60/x thick. A single ovary and uterus are present (Fig. 117). The eggs are subspherical and 40 by 30^ in diameter; there is a delicate vitelline membrane, but no true eggshell.