EPIZOOTIC LYMPHANGITIS 125 



down, emitting a rich yellow, tenacious pus. New swell- 

 ings form along the course of the radiating lymphatic 

 vessels. These also break down and discharge later. 

 Healing may occur in some of these broken down areas. 

 At times this healing is permanent, but in many instances 

 new abscesses form on the site of the old ones. Those 

 that heal leave little or no sear. In this manner the dis- 

 ease may continue for months, either confining its activ- 

 ity to a restricted area, or else involving a considerable 

 portion of the integument. In very mild cases the mani- 

 festations are not so pronounced, limiting themselves to 

 pustular, pimply areas that resist treatment indefinitely. 

 Epizootic lymphangitis must be differentiated from: 



1. Cutaneous glanders. 



2. Botryomycosis. 



The absence of other symptoms of glanders is estab- 

 lished by clinical examination. If the result of such exam- 

 ination is not decisive, malleinization is essential. The 

 absence of the characteristic granules in the active area 

 differentiates the condition from botryomycosis. 



Treatment. The treatment of this disease has not 

 proved very satisfactory. Enucleation of affected lym- 

 phatic glands and the thorough dissection of involved 

 lymphatic vessels may terminate the condition, if per- 

 formed early enough. Later cauterization and persist- 

 ent antiseptic treatment, both internally and externally, 

 must be used. All cases should be handled as an infec- 

 tious disease, and proper precautionary measures should 

 be taken to prevent the transmission of the disease to 

 other horses. Infection is by direct contact only, from 

 the use of currycombs, brushes, and other agents. 



