292 



Fowl Pest. 



quantity of mucus in the mouth and in the nose, which is some- 

 times bloody. The lungs are congested and sometimes contain 

 atelectatic areas. 



The intestinal tract contains on the smooth mucous mem- 

 brane grayish-white, sometimes greenish excrement ; at the pas- 

 sage between the glandular and muscular stomach, as well as 

 between and on the conical protuberances of the glandular 

 stomach, there are superficial or deep hemorrhages, sometimes 

 only very small (Freese). The mucous membrane at the begin- 

 ning of the small intestines shows sometimes only catarrhal 

 reddening, in other cases it is inflamed more markedly. The 

 liver and spleen show no striking changes. The .kidneys are 

 either grayish-brown in color and cloudy or dark brown and 

 moist on the cut surface. The serous membrane of the egg yolk 

 is markedly congested, revealing sometimes hemorrhages which 

 may also be present in the yolk itself (Freese). 



Symptoms. The time of incubation in the natural infection 

 is, as a rule, 3 to 5 days, exceptionally 2, or on the contrary 

 it may be even 7 days (Freese), while after artificial infection 

 death ensues not infrequently inside of 36 to 48 hours. 



The disease connnences with depression and diminished 

 appetite, which condition soon changes to a conspicuous dullness 

 and sleepiness. The chickens creep into dark corners, and sit 



with drooping head and wrings 

 as when brooding, or crouch 

 motionless in one place. Even 

 at the onset of the disease they 

 do not resist being caught, and 

 some of the birds give a peculiar 

 loud cry when picked up. When 

 driven about they move Avitli a 

 staggering, irregular walk, later 

 it is hardly possible for them 

 to move at all. Setting them on 

 the perch they find their equi- 

 librium only after long balanc- 

 ing, or not at all. 



In the meantime the comb 

 and the wattles become dark 

 red, and finally are blackish- 

 red in color (hence the name 

 Kyanolophiaea), while towards 

 the termination of the disease 

 grayish scales sometimes de- 

 velop on the skin. A similar 



Fig. 53. Fever curve in chicken pest 

 Following inoculation of virulent blood 



discoloration is also observed around the eyes, while the eyelids 

 are usually closed, tears accumulating under them profusely, the 

 conjunctivae being injected and swollen. 



On pressure of the bill a grayish or reddish, tenacious 

 mucus oozes from the opening, and a similar secretion is also 



