SURRA. 553 



and in seA^ere cases some edema of the lower portion of the legs, and 

 perhaps of the sheath in horses. At the termination of the period 

 of fever the temperature will be found to have fallen to normal or 

 nearly so; the animal will present a brighter aspect, and there is 

 every appearance of its return to health ; but in a few days the animal 

 again appears dull and half asleep; the temperature becomes elevated, 

 and a relapse takes place, and a repetition of all the symptoms in the 

 primary paroxysm, including the reappearance of the parasite, is 

 observed. 



DIAGNOSIS. 



Certain symptoms (anemia, fever, petechia^, ravenous appetite, 

 extreme emaciation, high mortality, etc.) would naturally give rise to 

 a suspicion of surra. The positive diagnosis should, however, be 

 made with a microscope. In case of suspected surra no delay in con- 

 firming or disproving the suspicion should be permitted. 



TREATMENT. 



No satisfactory treatment is known. Intravenous injections of 

 FoAvler's solution of arsenic give temporary relief, but relapses occur. 

 In view of the great economic importance of this disease, it would 

 not be advisable to attempt to treat any sporadic cases should they 

 occur in this country. On the contrary, the animals should be slaugh- 

 tered immediately and their carcasses promptly burned. 



