20 



MALARIA 



The various types of malaria are due to the fact that 

 there are several species of parasitic plasmodia, each 

 of which produces specific symptoms. Three distinct 

 types are usually recognized : (i) Mstivo-autumnal or 

 Malignant Tertian, (2) Tertian or Benign Tertian, and 

 (3) Quartan. 



Fig. 2. Diagram to show species of malaria parasites with reference to red corpuscles, 

 pigmentation, and sporulation. abc, benign tertian parasite {Plasmodium vivax) ; a'b'c , 

 malignant tertian parasite of aestivo-autumnal fever (Plasmodium precox) ; a"b' c ' ', quar- 

 tan parasite (Laverania malaria) ; a, a', a", normal unparasitized corpuscles; b, nearly 

 full-grown Plasmodium vivax in enlarged corpuscle ; c, sporulating specimen of the same ; 

 b , young Plasmodium prozcox; c' , sporulating specimen of the same ; b", young specimen of 

 Plasmodium malaria; c" sporulating specimen of the same. (Redrawn and adapted after 

 Deaderick.) 



a. Plasmodium precox (Hc^m amoeba precox, Plas- 

 modium falciparum, Plasmodium immaculatwni) is 

 the cause of sestivo-autumnal fever (malignant ter- 

 tian fever) of the tropics, with the paroxysm recurring 

 every forty-eight hours. The pigment granules in 

 this species are relatively few and very coarse (Fig. 



