152 



POULTRY DISEASES 



expulsion of mucus. There is a loss of appetite, 

 the hird appears weak, walks unsteadily, and be- 

 comes emaciated rapidly. At times breathing is 

 difficult, and there is often a diarrhea. 



Three stages then follow: catarrhal, character 

 ized liy a mucus, or muco-purulent, discharge ; the 

 diphtheric, affecting the mouth and throat and 



Fig. 48. Diphtheric Roup in a Chicken 



A, The yellowish-white diphtheric patches on upper surface of tongue 



and lower jaw (natural size). 



B, diphtheric patches on hard palate and upper jaw. 



characterized by the formation of a membrane on 

 the surface which may be followed later by slough- 

 ing (formation of a mass of dead tissue) ; and the 

 conjunctival, affecting the eyes, and often causing 

 a destruction of the eyeball. 



Postmortem Appearance— The toxin (poison) 

 from the areas of disease is very destructive, as 



