586 DISEASES OF SWINE 



back part of the throat, just behind and below the root of the 

 tongue. Lying right alongside the larynx is the upper end of the 

 digestive tube, known as the pharynx. Just in front of these two 

 structures the tonsils are to be found, one being located on either 

 side of the entrance to the throat from the mouth. These three 

 organ's, lying as they do in close association with each other, are 

 often all involved in any inflammation which may affect one or 

 other of them. Accordingly, we find that when we have an inflam- 

 mation of the larynx we are also hkely to have an inflammation of 

 the pharynx and perhaps also of the tonsil. Inflammation in any 

 one or more of these organs is commonly called sore throat, as one 

 of the most prominent symptoms is difficulty in swallowing. 



Causes. — The causes for a laryngitis are very much the same as 

 for cold in the head. Especially prominent as a cause for this con- 

 dition is improper sleeping quarters. When animals are over- 

 crowded in poorly ventilated sheds, or allowed to burrow under 

 straw-stacks and around manure piles, overheating and diseases of 

 the nose, throat, and lungs are sure to follow. The animal, coming 

 out from an overheated bed, steaming and sweating, is rapidly 

 chilled by the cold air of frosty mornings, and it is only a few hours 

 until a severe cough announces that trouble has been started. The 

 disease is, accordingly, much more common in cold weather, as this 

 is the season for overcrowding and chilling. 



Another frequent cause of inflammation of the larynx is the 

 inhalation of impure dust and irritating chemical vapors. In 

 animals that are fed on distillery mash the vapors of the alcohol 

 contained in the mash may cause sore throat and cough. Fre- 

 quently in giving drenches irritation of the larynx is produced and 

 cough and sore throat follows. Wallowing in cold water when over- 

 heated is another cause for the trouble. 



Sore throat is a very common complication of many of the acute 

 infectious diseases, and especiafly so of hog-cholera. 



Symptoms. — Cough is the all-important symptom in all forms 

 of inflammation of the larynx and the surrounding structures. 

 This cough is at first short, sharp, and dry in character. It is es- 

 pecially provoked when the animal comes out from an overheated 

 shed into the open air. It is also brought on by exercise or by 

 drinking cold water. It often occurs in spasmodic attacks, and, as 



