180 THERISEOFANIMALLIFE 



normal hosts- piq and rat 



infected pork S crops and rofs 



cyst in 

 piq or rat muscle 



poorly cooked pork 

 conta\n>nq cysts 



accidental host - man 



larva in blood vessel 



Fig. 10-5. Life cycle of trichina (Trichinella spiralis). 



pie throughout tropical and subtropical re- 

 gions of the world. People in certain com- 

 munities of our southeastern states are 

 heavily infested which, in part at least, is 

 responsible for their "poor white trash." It 

 is little wonder that they are lazy and shift- 

 less when their intestinal walls are teeming 



with hookworms sapping their strength. 

 Children tend to be retarded both physi- 

 cally and mentally which, coupled with ex- 

 treme poverty and ignorance, dooms them 

 to a life filled with misery, frustration, and 

 servitude. 



The adult hookworm differs from ascaris 



