. The dog as a carrier of parasites and diseases. Dogs as carriers of disease; Dogs. 18 BULLETIN 260, V. S. DEPARTMENT OP AGKICULTUBE. of such infestation. Ascarids at times enter the appendix and cause appendicitis; they may perforate the intestine and cause peritonitis; they may come up the esophagus and get down the windpipe, with a resultant suffocation, or enter the eustachian tube of the ear. These are unusual cases for the most part, but they are dangers to be con- sidered. There are other unpleasant and dangerous features of ascarid infestation, and the uncomfortable certainty that the
. The dog as a carrier of parasites and diseases. Dogs as carriers of disease; Dogs. 18 BULLETIN 260, V. S. DEPARTMENT OP AGKICULTUBE. of such infestation. Ascarids at times enter the appendix and cause appendicitis; they may perforate the intestine and cause peritonitis; they may come up the esophagus and get down the windpipe, with a resultant suffocation, or enter the eustachian tube of the ear. These are unusual cases for the most part, but they are dangers to be con- sidered. There are other unpleasant and dangerous features of ascarid infestation, and the uncomfortable certainty that their pres- ence is imdoubtedly indicative of fecal contamination of food, drink, or ingesta of some sort. The prophylaxis in this case, as in the case of the previously men- tioned worms, depends on keeping dogs free from worms and restrict- ing their privileges in the household and in their relationship to human Fig. 10.—Head of a dog split in half to show three tongueworms (Lingua- tula rhinaria), a, in the nasal cavity. Reduced in size (after Colin). Tongueworm.—The tongueworm, Linguatula rhinaria {Linguatula serrata) (fig. 10), occurs in the adult stage in the nasal passages and frontal sinuses of the dog. It is light colored and shows an external, ringlike segmentation. The male may attain a length of 20 millimeters (about three-fourths of an inch) and the female may attain a length of 100 millimeters (about 4 inches). The eggs de- posited by the female leave the nostrils of the dog in the catarrhal secretion occasioned by the presence of the parasite, some of them doubtless being sneezed out, and contaminate the vegetation on which they at times lodge. Such vegetation may be eaten by cattle, sheep, horses, or swine, or if the infested dog has access to a truck garden or a family vegetable garden, contaminated lettuce, cabbage, etc., may be eaten by man. When the eggs get to the stomach the shell is digested off, releasing a peculiar embryo which shows by its st
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