STRANGLES— CORYZA CONTAGIOSA EQUORUM 361 



the laryngeal or bronchial mucous membranes are much 

 swollen, dyspnea with dilation of the nostrils occurs, the 

 frequency often as high as 25 per minute. 



The Pulse. — The pulse in the beginning of the disease is 

 not much affected but later may reach 76 or higher. 



The Conjunctiva. — Frequently in the earlier stages there is 

 a flow of tears, and later a thick mucous discharge from the 

 inner canthus of each eye. In mild cases this symptom may 

 not appear. 



Irregular Strangles (Bastard Strangles). — In nearly every 

 enzootic of strangles some cases develop which differ in symp- 

 tomatology from the typical form described. The principal 

 difference between the regular and irregular types of strangles 

 lies in the fact that in the latter the abscesses develop by way 

 of metastasis in parts of the body other than in the submax- 

 illary region. In irregular strangles any part of the organism 

 may be elected as the seat of an abscess, although lymph 

 glands are most apt to be involved. 



For practical reasons only the most common seats will be 

 considered. They will be grouped according to the part of 

 the body in which they appear. 



Head. — (a) Abscess in the pharyngeal lymph glands. 

 When these glands are involved there develops in the sub- 

 parotid region a swelling which may be quite extensive. It 

 may reach the upper surface of the larynx, displacing the 

 organ ventrally, and cause dyspnea. As the pharyngeal 

 lymph glands lie on the lateral surface of the pharynx, their 

 enlargement may interfere with swallowing. A spontaneous 

 rupture of the abscess may occur, the pus discharging into the 

 pharynx (sudden, profuse nasal and mouth discharge) or into 

 the guttural pouches (sudden disappearance of the swelling, 

 copious nasal discharge, dysphagia). 



(b) Abscess in the anterior cervical lymph glands. This 

 causes swelling in the region of the thyroid glands. Fluctua- 

 tion is usually present. The abscess usually bursts outwardly, 

 although it may rupture into the gullet and lead to esophageal 

 fistula. If the adjacent omohyoid muscle becomes infiltrated 

 with pus, dysphagia and aspiration (foreign-body) pneumonia 

 can follow. 



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