. The dog as a carrier of parasites and diseases. Dogs as carriers of disease; Dogs. THE DOG AS A CARRIER OF PARASITES AND DISEASE. 19 the walls of the intestine and encysts in the lungs, liver, kidney, lymphatic glands, etc., where it develops to the larval stage (fig. 11). Subsequently they break out of their cysts and resume their migra- tions, wandering through the tissues, causing more or less damage, until they reach the abdominal or thoracic cavity, sometimes enter- ing the intestines and bronchj, and at times causing the death of the host. Just how they get from here to the nasal passa
. The dog as a carrier of parasites and diseases. Dogs as carriers of disease; Dogs. THE DOG AS A CARRIER OF PARASITES AND DISEASE. 19 the walls of the intestine and encysts in the lungs, liver, kidney, lymphatic glands, etc., where it develops to the larval stage (fig. 11). Subsequently they break out of their cysts and resume their migra- tions, wandering through the tissues, causing more or less damage, until they reach the abdominal or thoracic cavity, sometimes enter- ing the intestines and bronchj, and at times causing the death of the host. Just how they get from here to the nasal passages of the dog is not very well known, though it is certain that this takes place. Possibly larvae are at times sniffed up by the dogs as they nose through an infested carcass; possibly in eating such a carcass larvse pass directly from the mouth of the dog back to the posterior por- tion of the nostril by way of the pharynx, or the parasite may re- turn from the stomach by way of the esophagus. The adult worm has been reported, but very rarely, from the nasal passages of man. The larvae are apt to be overlooked in necropsies on the human cadaver, but have been recorded in as high as 25 per cent of necropsies. In various localities in Germany they are commonly present in 3 to 4 per cent. This is a widely distributed parasite, and is found from time to time in the United States. A case in man has been recorded from the Canal Zone. Prevention consists in keeping viscera of ani- mals away from dogs, unless the viscera are cooked, and in a reasonable attention to what a dog eats, and this involves a responsible supervision of the dog's wanderings and conduct in all FLEAS AND TICKS. Fig. 11.—Linguatula rhinaria, the larval tongueworm from the liver and lymph glands of cattle, sheep, etc. En- larged ten times (after Rallliet), Fleas.—In the western United States investiga- tions indicate that the commonest flea attacking man is the so-called human flea, Pulex irriians,
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