61 



ORDER H^EMOSPORIDIA. 

 (Sporozoa parasites of the red blood corpuscles.) 



Structure and Life History of the Malaria Parasites of Man. 



Name the Three Kinds of Malaria Parasite which occur 

 in the Blood of Man, and state the form of Malaria 

 Fever which each causes. 



Plasmodium falciparum (syn. Laverania malaria) is the 

 parasite of pernicious or aestivo- autumnal malarial fever. 

 Plasmodium malarice is the parasite of quartan ague. 

 Plasmodium vivax is the parasite of tertian ague. 



How is Malaria transmitted from Man to Man ? 



By the " bite " of female mosquitoes or gnats of the- 

 genus Anopheles (e.g., Anopheles maculipennis, which is 

 the carrier of malaria in Southern Europe). 



How is the Malaria Germ introduced into the Blood of Man ?' 



When an infected mosquito " bites " (i.e., pierces the 

 skin with its proboscis), the germ (the sporozoite) is con- 

 veyed in the salivary secretion which passes into the wound. 



Describe the Sporozoite. 



It is a minute filamentous organism. It tapers to a 

 sharp point at each end ; and in the thicker middle por- 

 tion there is a nucleus. 



State the subsequent History of the Sporozoite t giving a 

 brief Account of the Schizogonous Cycle. 



The Sporozoite enters a red blood corpuscle, becomes 

 rounded, enlarges, and a conspicuous vacuole appears 

 in position so close to the nucleus that the parasite re- 

 sembles a signet-ring (the so-called " signet-ring " stage). 

 Then the vacuole disappears and the parasite becomes 

 an amceboid trophozoite. Black pigment (melanin) collects 



