CHAPTER VIII. 



CONTAGIOUS DISEASES. 



1. DIPHTHERIA OK ROUP 



Diphtheria, cioup ur roup, is a very common dis- 

 ease among poultry, and undoubtedly destroys millions 

 of dollars worth of fowls in the United States every 

 year. There are two forms of roup, one caused by 

 bacteria and the other by protozoa, but since the synip 

 toms, remedies and means of 

 prevention are very much 

 alike in both cases it is not 

 necessary that they should 

 be considered separately in 

 this report. 



Roup is, in all cases, a 

 contagious or "catching" 

 disease. It spreads from 

 one fowl to another and 

 may be carried from flock 

 to flock by the interchange 

 of birds. It is thought by 

 some that roup may be pro- 

 duced by exposure, and that 

 it is merely a severe cold or 

 catarrh, but careful observa- 

 tion shows that this view is 

 not correct, and that roup 



(91) 



L 



The Fi.ooh of the Mouth 

 A Fowr., Showing Dipbth 

 RiTic Patches. 



V\ 



