208 



DISEASES DUE TO PROTOZOA 



Trichomonas. Two protozoa of a slight medical 

 importance are the Trichomonas vaginalis, with its 

 nearly related varieties, T. intestinalis and T. pulmon- 

 alis, and the Lamblia intestinalis. These forms may 

 infest the vagina, intestine, or lung, and cause some 

 irritation, probably not particularly inflammatory. 

 They are held responsible oftentimes for the inflamma- 

 tion set up by bacteria gaining entrance at the site 



FIG. 61 



FIG. G2 



Trichomonas vaginalis. 

 (Blochmann.) 



Lamblia intestinalis. 

 (Schewiakoff.) 



of the irritation by the protozoa. However, the 

 vaginitis and cystitis caused by the T. vaginalis is a 

 serious matter in children. These are usually pear- 

 shaped bodies, with prominent nucleus and well- 

 marked anterior flagella. The trichomonas has a 

 heavy undulating membrane. 



SPOROZOA 



Malaria. The most important disease caused by 

 protozoa is malaria. This is an infectious disease 



