278 ILLINOIS STATE ACADEMY OF SCIENCE 



gastro-intestinal upset if nothing worse might be caused 

 by a young child eating infected eggs. This disease is 

 very prevalent in poultry in Illinois. 



Another problem that keeps recurring is the relation 

 of paralized animals to poliomyelitis. In Illinois a few 

 years ago the writer had the opportunity to study several 

 outbreaks of paralysis among animals which epidemio- 

 logically were closely related to poliomyelitis among chil- 

 dren. Laboratory studies however were negative. The 

 animals included in these studies were colts, hogs, and 

 chickens. 



Brief mention should be made of intestinal parasites. 

 Tenia saginata, the beef tapeworm, Tenia solium, the 

 pork tapeworm, and Dibothriocephalus latus, the fish 

 tapeworm, all infect man. Belascaris mystax is a com- 

 mon parasite of the dog and cat and hence found in chil- 

 dren. 



Some of the arthropods are subject to diseases quite 

 fatal to man. Among these are ticks, transmitting re- 

 lapsing fever and rocky-mountain spotted fever, lice, 

 which spread typhus fever, mosquitoes whose bite causes 

 malaria, yellow fever, dengue and filaria, and the flies es- 

 pecially in regard to sleeping sickness. 



This paper must not be closed without including an 

 animal disease which is not fatal to man, but which has 

 actually been the means of saving a countless number of 

 human lives. This is cowpox, infection with which will 

 prevent the fatal smallpox in human beings. 



