92 



DISEASES DUE TO PROTOZOA 



It is supposed that some parasites degenerate, neither segmenting 

 nor forming gametes. 



The various stages of growth and the segmented "daisy" body 

 are more frequently seen in the peripheral blood than those of other 

 varieties. 



This fever was formerly common in England. 



It is more common in temperate than tropical climates. 



Cachexia is not so common with this as other malarial fevers. 



The individual attacks are very amenable to quinine, but the 

 parasites are more difficult to kill off than those of other varieties 

 (Manson). 



If untreated the fever is supposed to exhaust itself and die out, but 

 spontaneous cure is rare. 



Double, Triple and Mixed Quartan Fevers. 



These occur when there are two or three families of the same kind 



Double quartan. 



of parasite present. There is a daily fever. The condition is 

 diagnosed by the microscope only. The rises of temperature may be 

 unequal for each family of parasites present, but when there are other 

 varieties of malarial parasites the condition is known as a mixed one, 

 and greater differences of temperature variation may be noticed. 



Major Donovan records one case in which he found the three 

 varieties of malarial parasites. This seems to favour Laveran's view 

 that the malarial parasites constitute a single species with three 

 varieties, a view not widely held. 



Simple Benign Tertian Fever. 



The parasite is P. vivax. 

 The cycle is forty-eight hours. 



The very young form is indistinguishable from that of the quartan, 

 but later one sees — 



Much more amoeboid movement. 



