858 





Infectious Anemia of Horses. 



of the blood plasma in the tube, com- 

 pared with that of the layer of the red 

 blood corpuscles, is in a ratio of 6:4.) 

 It is advisable to employ specially gradu- 

 ated test tubes for this purpose. 



The red blood corpuscles 

 appear pale, and in their cell 

 bodies basophilic granules 

 (fragments of the cell nuclei) 

 may be recognized, which may 

 be mistaken ' for endoglobular 

 parasites (Carre & Vallee). 

 Contrary to the observations 

 of Carre & Vallee, Ostertag 

 and Marek found no changes 

 in the form of the red blood 

 corpuscles. 



According to the view of the authors 

 the apparent poikilocytoses are frequently 

 only artifacts. If, for instance, the blood 

 is smeared onto a cover glass in a some- 

 what thicker layer or in a moist place, 

 the red blood corpuscles assume the most 

 varied changes of form because of the 

 somewhat slow drying. 



Under gradual loss of the 

 strength, finally an apparent 

 paralysis of the hind parts de- 

 velops; not infrequently how- 

 ever the animals are capable 

 of standing almost until the 

 time of death. In pregnant 

 mares abortion results almost 

 invariably. 



The duration of this acute 

 form, according to Carre & 

 Vallee, is from 5 to 15 days, 

 on an average one week, but 

 according to Marek 's observa- 

 tions the disease may in young 

 foals last only 1 to 2 days, and 

 in adult animals, on the other 

 hand, not infrequently for 3 

 to 4 weeks (see Fig. 154). . 



The chronic form of the 

 disease manifests itself with 

 periodical febrile attacks and 

 with indications of anemia, 

 which is not recognizable in the 

 acute form, on account of the 

 peculiar diffuse red coloration 

 of the mucous membranes. 

 The febrile attacks appear at 



