404 DISEASES LOCALIZED IN CERTAIN ORGANS 



being filled with yellow exudate. The episcleral blood- 

 vessels are congested. From the fibrinous iritis the animal 

 is often blind. 



The Respiratory Tract. — There is at first a thick, viscid, 

 purulent, later more fibrinous nasal discharge, mixed with 

 blood, which finally becomes discolored and fetid. The 

 croupous masses forming in the larynx narrow its lumen, 

 cause noisy dyspnea, and at times distressing cough. The 

 sinuses of the head may become filled with exudate and the 

 horn core inflamed leading to the horns becoming loose. In 

 thrashing- about, the patient often knocks off the loosened 

 horn. 



The Digestive Tract. — The buccal mucosa is early red- 

 dened. Later in the course of the disease the gums, lips and 

 hard palate become eroded. Croup membranes are some- 

 times noted on the mucous surface of the lips, cheeks and 

 palate. The animals drool and fetid croup masses are occa- 

 sionally ejected from the mouth. There may be dysphagia. 

 The appetite is impaired. Water is drunk in small quan- 

 tities. The bowels are constipated during the height of the 

 fever, the feces tar-like. In the latter stages there is diarrhea. 

 The feces are said to contain fibrinous masses and blood in 

 some instances. 



Skin. — An eczematous eruption (papulovesicular) has 

 been observed. The skin of the head, especially at the nos- 

 trils is most apt to be involved, although the coronets may 

 be elected. 



Udder. — In cows the milk secretion stops. Rarely a coin- 

 cidental mastitis occurs. 



If the patient live several days it emaciates and becomes 

 anemic. 



Course. — ^The course is acute. The initial symptoms usu- 

 ally last one day. In three to four days the disease is fully 

 developed. The patients rapidly emaciate and generally 

 become unconscious and die in from fom- to eight days. In 

 some cases this disease may be prolonged three to four weeks 

 and end in recovery. 



Prognosis. — Mortality 60 to 90 per cent. Marked nervous 

 symptoms, high fever after the second day (pneumonia) are 



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