PURULENT INFLAMMATION OF THE UDDEIL 
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massage will be found to assist discharge of secretions from the finer 
milk ducts. The diseased udder must be kept warm, and may be rubbed 
with fat and covered with cotton wadding. Where the disease is clearly 
infectious, which may be discovered by microscopical examination of the 
milk, disinfectants may be injected. Weak solution of iodine in potassium 
iodide is most efficacious. The animal is milked dry, and the fluid injected 
with a syringe or a teat syphon provided with a rubber tube and funnel. 
The udder should then be massaged to distribute the fluid and the latter 
removed by milking. 
(c) PURULENT INFLAMMATION OF THE UDDER. MASTITIS APOSTEMATOSA. 
In this form the inflammation also originates in the milk ducts and 
alveoli, but, instead of remaining confined to their surface, spreads to 
the depths and to the interstitial connective tissue. 
The purulent catarrh affecting the lining membrane of the milk ducts 
is accompanied by phlegmonous inflammation of the connective-tissue 
substance of the stroma of the gland. Franck was the first to produce 
the disease experimentally, by injecting a decomposed meat extract into 
the galactophorous sinuses in cows. Next day that portion of the udder 
was inflamed, the milk was curdled, puriform, containing numerous pus 
corpuscles and micrococci, and when injected into the udder of a healthy 
cow reproduced the same disease. Purulent mastitis is clearly produced 
in a similar way, and therefore always remains confined to single quarters 
of the udder. Kitt described the disease very thoroughly : he found 
“ excessive cellular infiltration of the entire connective tissue of the 
udder, emigration of cells, even into the lumen of the alveoli, necrosis 
and shedding of the epithelium of the gland, ectasia of the milk ducts, 
and concretions, consisting of gland secretions, which had undergone 
necrobiotic change, and exudate, hyperplasia of the connective tissue 
produced by extensive formation of fibroblasts, and atrophy of the 
tubuli of the gland.” 
Causes. There is no doubt that this form of mastitis is caused by 
infectious materials entering through the mammary ducts (galactogenous 
mastitis, Kitt). Experiments have shown that normal milk contains no 
organised ferment, and therefore, when such is found, it must have 
entered from without; further, as the disease process always appears in 
a single section of the gland, the natural conclusion is that infection 
follows through the mammary duct. Although infection through the 
blood stream is possible, it is unquestionably very rare. On the other 
hand, opportunities for infection through the milk canal are frequent. 
The little drop of milk left hanging on the teat after milking may 
facilitate it, or milk catheters or other instruments introduced into the 
mammary duct also act as bearers of infection. The experiments of 
V.S. G G 
