364 VETERINARY HYGIENE 



sarcoptic mange has been detected by the dairyman he can do much 

 to prevent its further spread. Needless to say, mangy cows should 

 be immediately dressed with suitable dressings, care being taken 

 to avoid mercurial or other poisonous chemicals or substances likely 

 to taint the milk. Affected cows should be stalled together with 

 as many empty stalls as possible between them and clean animals. 

 There must be no interlapping of the bedding, and no common 

 use of udder cloths or grooming tools. 



Diseased cows should be milked and attended to the last of the 

 herd, and it were wise if the milkers used separate overalls and caps 

 when milking such animals. It is however very difficult to induce 

 dairymen, at least most city dairymen, to take vigorous steps to 

 eradicate the trouble. 



There is little doubt that the warm moist atmosphere so often 

 found in city byres favours the rapid multiplication of the parasites. 



DEMODECTIC MANGE. 



Demodectic or Follicular Mange is commonly associated with 

 a marked dermatitis with pustule formation and the presence in 

 the nodules of the Demodex. The demodex is to be found on all 

 domestic animals and on man, but is generally recognised to have 

 pathological interest and to produce or to be associated with disturb- 

 ing lesions chiefly in the dog and pig. A follicular dermatitis has, 

 however, been recorded in the goat, ox and other animals. The 

 parasite has been found repeatedly on the horse, and the author 

 on more than one occasion has found it associated with skin 

 depilation. 



Canine follicular mange is generally considered to be but rarely 

 and with difficulty transmissible by contact between diseased and 

 healthy animals, and how the disease originates or what are its 

 exciting or predisposing causes are as yet unknown. It has been 

 suggested, and there is reason to believe, that the demodex may be 

 a common and usually innocuous resident in the dog's skin. A. E. 

 Mettam isolated a staphylococcus from an advanced case and from 

 it prepared a vaccine which had definite curative action, which gives 

 support to the opinion of others that the demodex is but the exciting 

 factor in the disease. 



PREVENTIVE MEASURES. Though infection from one dog to 

 another by contact, either directly or indirectly, is not regarded as 

 common, it would be unwise to regard follicular mange in any 

 animal as non-contagious, and precautions should therefore be taken 

 accordingly. Infected animals should be isolated, and in the case 



