PREVENTION, SYMPTOMS AND TREATMENT 



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larynx, falling in of the arytenoid cartilage, and therefore obstruc- 

 tion to breathing. 



The neuritis may be due to toxins arising in acute infections of 

 the respiratory tract (pleuro-pneumonia, strangles, pharyngitis, 

 laryngitis). Roaring may also be caused by obstructions, stenoses, 

 new growths and thickening of the mucous membranes of the upper 

 breathing passages. 



The disease is chronic and exhibited by a whistling, roaring, 

 wheezing or snoring sound occurring during, or directly after, 

 exercise and associated with dyspnea. The left arytenoid cartilage 

 yields more readily to manual pressure than its fellow and pressure 

 gives rise to noisy breathings in advanced paralysis. 



Treatment. — Roaring due to paralysis of the larynx is in- 

 curable by drugs and can only be relieved by arytenectomy. Fol- 

 lowing acute inflammation of the throat, the use of a cantharidal 

 blister to the larynx, and sodium iodide (H., 3ii thrice daily), may 

 be serviceable in thickening of the mucous membranes. The subcu- 

 taneous injection of strychnine sulphate (average dose gr. i) once 

 daily into the region of the larynx is said to delay the onset of the 

 paralysis in the early stage. Other causes of roaring must be at- 

 tacked according to their nature. 



Scab or Mange in Sheep. 



This disease, caused by the Dermatodectes (or Psoroptes) 

 communis, var. ovis, is of immense economic and medical import- 

 ance on of account of its widespread and common occurrence in 

 sheep. The parasites attack the root of the tail, back, sides, neck and 

 shoulders. The patients rub, scratch and bite themselves. The 

 skin is variously inflamed with papules, pustules, crusts, with falling 

 of the fleece in patches. One case may infect a whole flock. Lambs 

 and yearlings are most susceptible. 



Treatment. — In addition to isolation of the sick and disinfec- 

 tion of premises and objects which have come in contact with pa- 



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