COMMUNITY SANITATION 



431 



called anopheles (Figure 378), yellow fever is carried by 

 another species called stegomyia (Figure 379) . The name 

 of our common mos- 

 quito, which is con- 

 sidered comparatively 

 harmless, is the Culex 

 (Figure 380). 

 One of the main 



duties Of the United FlG> 378 ' ~ The Malarial Mosquito (anopheles). 



States in taking up the administration of Cuba and the 

 work of the Panama Canal was the extermination of 

 the yellow fever and malaria mosquitoes. This was ac- 

 complished by drain- 

 ing and filling, and 

 by a thorough clean- 

 ing up of filth of 

 various sorts (Figures 

 381, 382). 



Several other dis- 

 eases are spread by protozoa in the bodies of insects. 

 The terrible sleeping sickness of Africa is caused by the 

 Tsetse fly ; the bubonic 

 plague is carried by a 

 kind of flea which infests 

 rats; and the spotted 

 fever and cattle fever by 

 species of ticks. 



Quarantine. There is 

 one general method of 



preventing the Spread Of FIG. 380. The Harmless Mosquito 



germs which is used in 



dealing with all kinds of infectious diseases. This is the 



setting apart from the community of an individual or 



FIG. 379. The Yellow Fever Mosquito 

 (stegomyia) . 



