. The clinical pathology of the blood of domesticated animals. Blood; Veterinary medicine. 158 DISEASES DUE TO ANIMAL PARASITES quiescent the eosinophilia may disappear (Cabot). Cabot states that the characteristic blood lesions change trichinosis from the position of a disease very difficult and uncertain of diagnosis (without excision of a bit of muscle) to one whose recognition is usually easy. Opie in an experimental study fed pork containing different numbers of trichina larvae to guinea pigs and obtained the following results: ''The administration of trichina spiralis to the guinea pig c
. The clinical pathology of the blood of domesticated animals. Blood; Veterinary medicine. 158 DISEASES DUE TO ANIMAL PARASITES quiescent the eosinophilia may disappear (Cabot). Cabot states that the characteristic blood lesions change trichinosis from the position of a disease very difficult and uncertain of diagnosis (without excision of a bit of muscle) to one whose recognition is usually easy. Opie in an experimental study fed pork containing different numbers of trichina larvae to guinea pigs and obtained the following results: ''The administration of trichina spiralis to the guinea pig causes an increase of the eosinophile leucocytes in the blood, comparable to that which accompanies human infection. There is no constant alteration of the number of these cells until the end of the second week after infection, when their relative and absolute number rapidly increases and reaches a maximum at the end of the third week. At this time em- bryonic trichinae are in process of transmission from the intestinal mucosae Fig. 23. Filaria immitis in blood, dog. , c .1 -i a .- by way 01 the lymphatic vessels and the blood through the lungs to the muscular ; Drake examined the blood of 15 swine, the muscle of which he had found contained larval trichinae, and found that there was no increase in the numbers of eosinophiles. The blood contained the following percentages of leucocytes: lymphocytes 53-72, aver- age ; polynuclears 26-42, average ; eosinophiles , average He concludes that there is in swine trichinosis no increase in the percentage of eosinophiles. Another explanation, however, is possible, that his examinations were made in a stage too late to show the increase. Filariasis.—In an old dog much emaciated and showing marked ascites, Burnett and Traum found larvae of Filaria immitis in the peripheral blood. The blood examination gave the following: red corpuscles 2,642,000, hemoglobin 57, leucocytes 24,590. Of the leucocytes there wer
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