INFECTIOUS DISEASES 41 



tic patch and subsequent dressings with tinc- 

 ture of iodine may succeed in arresting the in- 

 volvement of fresh tissues and in locahzing the 

 infection. 



Streptobacillary Pseudotuberculosis 



This disease is characterized by the forma- 

 tion of nodules or tubercles resernbling true 

 tuberculosis, but animals affected do not react 

 to tuberculin, the etiological factor being a spe- 

 cific streptobacillus. The bacillus appears as 

 a short rod, measuring 1 to 2 microns long and 

 having rounded extremities. Chain formation 

 is frequent and the bacillus assumes varying 

 forms, depending on the conditions and loca- 

 tions in which it grows. In culture media, it 

 varies from the typical rod shape in fresh cul- 

 tures to the ovoid form in old cultures ; it has a 

 tendency to form zooglea. In the tissues varia- 

 tions are frequent, depending on the age of the 

 growth. It is a facultative anaerobe, stains 

 with ordinary aniline dyes, but is Gram nega- 

 tive. 



The disease attacks rabbits of any age and is 

 very fatal. 



Symptoms. — Gradual and progressive ema- 

 ciation, with great weakness, disinclination to 

 feed or exercise. Panting respirations; f lir dull 

 and rough. The greatly enlarged abdominal 

 and sublximbar lymphatic glandis can easily be 

 palpated. The submaxillary and prepectbral 



