. Special report on diseases of cattle . Cattle. THE ANIMAL PARASITES OF CATTLE. 515 To prevent cattle from becoming infested with this parasite care should be taken that human feces are not placed where they will contaminate the feed or drinking water. GID. Bladder worms (Multiceps socialis, or Ccenurus cerebralis) which are occasionally found in the brain of cattle, and cause gid, "turn- sick," or "staggers," deserve mention, as they are rather common among sheep in the Northwest. As already alluded to, these worms are the intermediate stage of a tapeworm found in dogs, a
. Special report on diseases of cattle . Cattle. THE ANIMAL PARASITES OF CATTLE. 515 To prevent cattle from becoming infested with this parasite care should be taken that human feces are not placed where they will contaminate the feed or drinking water. GID. Bladder worms (Multiceps socialis, or Ccenurus cerebralis) which are occasionally found in the brain of cattle, and cause gid, "turn- sick," or "staggers," deserve mention, as they are rather common among sheep in the Northwest. As already alluded to, these worms are the intermediate stage of a tapeworm found in dogs, and their life history and the means of preventing infection have been briefly discussed above (see p. 513). Cattle harboring this parasite show symptoms indicating an affection of the brain, walking or turning in circles, dizziness, un- even gait, impaired vision, etc. Treatment consists in trephin- ing the skull and removing the parasite, an operation which re- quires a skillful operator and is frequently unsuccessful. Unless ihe parasite is removed affected cattle almost invariably die. THREAD WORMS IN THE ABDOM- INAL Thread worms (FUaria labiato- „„„„». , , , ., . v Fig. 26.—Section of a pork tongue heavily m- papiUosa) 2 to 4 inches long are tested with pork measles. Beet tongues in- frequently found in the abdominal fested with bee£ measles present a 8imilar -1 J appearance. cavity. They seem to cause little or no trouble. The embryos produced by these worms enter the blood vessels. Stable flies (see p. 496) while sucking blood take up these embryos, which undergo a certain amount of development in the body of the flies. These flies, again biting cattle, introduce the partially developed worms with which they are infested into the circulation, whence the worms migrate to the abdominal cavity and there develop to maturity. The roundworms found occasionally in the anterior chamber of the eye (see p. 516) are perhaps immature forms of this species which h
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