28 



PIKOPLASMOSIS. 



pear-shaped bodies in the blood corpuscles, 1-3 to 1-5 /x in 

 length, and in this species two occur in each corpuscle. They 

 may appear as rod-shaped bodies. Free forms also occur in the 

 blood and sometimes a flagellate form. They increase in the 

 blood corpuscles hy binary fission. Animals with these para- 

 sites may he immune, but their blood injected into other 

 animals will cause the disease. Eelapses also take place. The 

 intermediate hosts of this disease are the Ticks (Ixodes ricinus) 

 and {Rhqw-ephalus {BoopUilus) annulafus). The malignant 

 jaundice in dogs is caused by PiropJasma canis, the East Coast 



CJ 



^ 







FlKOrLASM.i:. 



A to D, I'inqilasma higemina. Rinj; forms a b; pear-shaped forms c and d. e and i;, 

 Pir(fpliisiiM aanis in blood corpuscles, f, Parasite free in blood. (Greatly enlarged.) 



fever by P. parvum, another is found in the horse, P. equi-^ 

 all these have intermediate Tick hosts (vide Ticks). For in- 

 formation concerning other forms, such as P. parvum (Theiler), 

 the parasite of East Coast or Ehodesian fever, the P. cani,% 

 causing malignant jaundice in dogs, and P. cqui in horses, the 

 student is referred to Professor Minchin's recent work on 

 Protozoa. 1 



^ An Introduction to the Study of the Protozoa. By E. A. Miuchiu, 

 M.A. 1912. 



