GENERAL DISEASES. 47 



Immunity. — An attack doubtless renders an animal less 

 liable to future ones, but it is not absolutely protective. 



Symptoms of the Benign Form. — The animal is dull 

 and shows signs of mild catarrh. The disease is ushered in 

 with simple continued fever. There is soreness of throat, 

 slight cough, difficulty of swallowing, and disinclination to 

 feed. 



The pulse and respiratory movements are somewhat 

 accelerated, and the temperature is elevated. 



There is swelling in the neighbourhood of the throat, 

 which may occupy the space between the rami of the lower 

 jaw, or may be found on one side of the throat only, or 

 may be more generally diffused. The swelling gradually 

 enlarges, and ultimately pus may be detected by fluctuation. 

 In some cases the glands and tissues in the region of the 

 larynx are more seriously involved, and the symptoms 

 become more severe. Oedema of the glottis, with implica- 

 tion of the other structures around, as well as general 

 infiltration of the submucous tissue of the larynx, which 

 may follow, cause difficulty of respiration and the production 

 of the trumpet-like sound in inspiration and expiration. 



This sound, which is most marked in inspiration, usually 

 passes off under treatment. Sometimes this inflammatory 

 condition is still more severe and persistent, and is a source 

 of danger to life by suffocation. 



Symptoms of the Malignant or Irregular Form of 

 Strangles. — The fever is more severe and the tissues of 

 the glands themselves become affected and suppurate. The 

 parotid glands, and sometimes the inguinal, mesenteric, 

 and tracheal glands become affected. 



The fever sometimes lasts for a considerable period. 

 AVhen abscess is formed in the internal organs, the 

 symptoms will vary in accordance with the organs involved, 

 and the fever will be subject to intermissions and irregular 



