MALARIAL FEVER IN HORSES. 



471 



altitudes. It appears most frequently during the months from March 

 to October, but may appear any time of the year, and affects only the 

 equine species. 



II. Cause. 



The viris, in blood, drawn from an infected animal, has been found 

 active after twenty-four hours. Five Oc. injected into a healthy animal 

 has produced the disease. 



Dr. Darling of the hospital force of the canal zone at the Isthmus of 

 Panama claims to have found a germ in all cases diagnosed as swamp 

 fever by veterinarians at the zone. 



A SECOND ATTACK, SECOND STAGE. 



The period of incubation after inoculation is from ten days to six 

 weeks. The onset of pernicious anemia is marked by an elevation of 

 temperature. If the mucous membrane is involved, it will run a chronic 

 course, lasting from six weeks to six months, or even longer. I have a 

 case in mind which lasted twenty-two months. It was under treatment 

 part of the time. 



It is considered' that flies, mosquitoes, and internal parasites act as 

 intermediate hosts for the parasite that causes pernicious anemia. 



The disease is characterized by a progressive anemia, remittent fever, 

 excessive urination and a gradual emaciation in spite of a good appetite. 

 The patient appears dull, listless, tires very easily, and exhibits more or less 

 stiffness of hind limbs. 



