MALARIA PARASITES 



n 



the South American Indians. Now other and more active synthetic 

 substances are available, especially mepacrine, paludrine and 

 chloroquine. 



TERMINOLOGY 



The following summary of the Ufe-history of the malaria parasite 

 gives in the left-hand column the terms generally used in zoology, and 

 in the right-hand column those used in medicine. Sohd lines represent 

 a reproductive process ; dotted ones development without reproduction. 



Zoological Terminology 



Medical Terminology 



►•TROPHOZOITE< 



(Ring-stage, amoebulae) 



SCHIZONT 



(schizogony) 



SCHIZOZOITES- 



* ^TROPHOZOITE^ 



I 



Development 



in man or 



other vertebrate 



SCHIZONT 



(schizogony) 



i 



•MEROZOITES 



GAMONTS 



I 



MALE 

 GAMETES 



FEMALE 

 GAMETES 



Development 

 in insect 



L 



GAMETOCYTES 



Exflagellation 



MICROGAMETES MACROGAMETES 



ZYGOTE- 



(Gnat) 



(Mosquito) 



ZYGOTE- 



J 



OOKINETE 



SPORONT 



OOCYST 



I 



— SPOROZOITES 



i 



SPOROZOITES 



BALANTIDIUM CO LI 



The Ciliata are not commonly parasites of man, but Balantidium 

 coli, which closely resembles B. entozoon (p. 60), may cause serious 

 disease, and even death. It normally lives in the large intestine 

 of the pig, which it appears not to harm, but if the cysts which 

 it forms are swallowed by man, it may penetrate the epithelium 

 of the gut and cause dysentery. It may occasionally be carried in 

 the blood stream to other parts of the body and there cause 

 abscesses. It occurs in all parts of the world. 



