SIMPLE COEYZA. 539 



SIMPLE COKYZA. 



Causes. Exposure to wet and cold, or to alternations of 

 temperature, bad ventilation, and damp stabling. Coryza 

 is frequently noticed in animals placed in new buildings 

 before the plastered walls have had time to dry thoroughly, 

 and in temporary sheds on damp ground, where no attention 

 is paid to running off the urine, &c. Weak, ill-conditioned 

 animals are more subject to the disease. The complaint is 

 common in the eastward of Scotland, and almost unknown 

 to the south-west. 



Symptoms. Simple coryza is indicated by sneezing, red- 

 ness and dryness of the pituitary membrane, soon followed 

 by a discharge of a thin colourless and irritating secretion. 

 Breathing is rendered more or less difficult according to the 

 state of engorgement of the membrane lining the nose, and 

 the determination of blood to the head is indicated by red- 

 ness of the eyes, tumefied eyelids, and heat over the frontal 

 region. Febrile symptoms vary in intensity, being almost 

 absent in some cases, arid severe in others. In two or three 

 days the discharge becomes thick, opaque, and purulent. The 

 more free the production of pus, the more rapidly does the 

 disease disappear, and resolution occurs by the rapid dimi- 

 nution in the quantity of the discharge and the restoration of 

 a normal condition of the nasal membrane. There is always 

 a tendency to the extension of congestion and inflamma- 

 tion towards the throat, and then cough and difficult swallow- 

 ing constitute diagnostic signs. 



Simple catarrh may result in chronic discharge from the 

 nose, either due to a persistent suppuration from the nasal 

 membrane itself, or from the sinuses connected with the 

 nose. If the flow continues beyond a fortnight or three 

 weeks, it constitutes a chronic catarrh or nasal gleet. 



