. The dog as a carrier of parasites and diseases. Dogs as carriers of disease; Dogs. 32 CIRCULAR 338, U. S. CtePT. OF AGRICULTURE Figure 31.—The tongueworm, Linguatula serrata. Upper figure, entire animal. Lower left-hand figure, head. Lower right-band figure, female tail, showing uterovagina (dotted) and intestine. Enlarged. From Sambon, 1922. Treatment.—There is no satisfactory treatment for salmon poison- ing; all drugs tried for the removal of the flukes have proved to be ineffective. It is reported that the disease may be prevented by the use of apomorphine within a few hoiu-s after dogs
. The dog as a carrier of parasites and diseases. Dogs as carriers of disease; Dogs. 32 CIRCULAR 338, U. S. CtePT. OF AGRICULTURE Figure 31.—The tongueworm, Linguatula serrata. Upper figure, entire animal. Lower left-hand figure, head. Lower right-band figure, female tail, showing uterovagina (dotted) and intestine. Enlarged. From Sambon, 1922. Treatment.—There is no satisfactory treatment for salmon poison- ing; all drugs tried for the removal of the flukes have proved to be ineffective. It is reported that the disease may be prevented by the use of apomorphine within a few hoiu-s after dogs have eaten para- sitized fish. The best prevention, of course, is to keep dogs from eating raw salmon taken in the area in which salmon poisoning occurs. TONGUEWORM INFESTATION Cav^e.—^The tongueworm, Linguatula serrata (synonym, L- rhinaria),^ is not a true worm, but is a degenerate relative of the spiders, ticks, etc. It lives as an adult in the nostrils of the dog and some other animals, and in this stage it is a wormlike animal with exter- nal ringlike segmen- tation (fig. 31). This parasite does not infest cats. The male is about four- fifths inch (18 to 20 millimeters) long, and the female is about 3 to 4 inches (8 to 10 centimeters) long. The eggs (fig. 32) from the female worms in the nostrils of the dog pass out in mucus when the dog sneezes or are swallowed and pass out in the feces. When these eggs are swallowed by suitable host animals in eating contaminated vegetation, as by herbivores in grazing, the eggs hatch and the larvae make their way, as a rule, to the liver, lungs, and lymph glands and there develop to the infective stage. In the United States these larval tongueworms are fairly common in cattle in the South; in Europe sheep are the most common intermediate hosts. In view of the fact that the larvae may also occur in man, and that the adult is reported from man in one case, this parasite must be looked on as dangerous. Up to the present time it has b
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