INFECTIOUS DISEASES 1 53 



or specific. A congested condition of the mucous 

 membrane lining tlie pharynx, larynx, and stomach, 

 enlargement of the spleen, and a congested con- 

 dition of the brain are sometimes present. Be- 

 cause of the desire to swallow indigestible objects, 

 foreign objects, such as stones, straw, pieces of 

 wood, etc., are frequently found in the stomach. 



The most constant lesions are microscopic in 

 character. These are present in the nerve tissue, 

 especially in the gray matter surounding the 

 cerebro-spinal canal, and consist of a hyperemia, 

 pigmentation, proliferation, and degeneration of 

 the cellular structure. 



Treatment. — The treatment of hogs in any way 

 is not practical. As soon as the animal develops 

 rabies it should be destroyed, or isolated, in order 

 to prevent any possible spread of the disease to 

 the other animals in the pen. Stray dogs should 

 be regarded with suspicion and not allowed to 

 loiter around the premises, or taken care of in the 

 proper manner, as it is the rabid dog, not manifest- 

 ing marked symptoms of disease, and allowed to 

 stay around the premises and mix with the stock, 

 that is the most dangerous. 



INFECTIOUS ARTHRITIS 



Inflammation of the joints is a disease of young 

 pigs from a few days to a few weeks old. It is 

 caused by germs entering the body by way of 

 the naval cord. Other tissues of the body besides 

 the joints may be involved. 



