DIAGNOSIS AND PREVENTION 41 
The gland is hard and in time becomes enlarged, due to the new formed 
tissue. The microscopic examination shows a thickened intertubular 
tissue, and the epithelial cells more or less disintegrated and sloughed 
from the tubular walls. The lymphatic glands and other organs of 
the body are not involved. The lesions are localized in the udder. 
The period of duration is variable, but always long. 
The prognosis is grave for the gland itself. It is rarely fatal to the 
animal. 
Diagnosis. The diagnosis is made by finding the streptococcus in 
the secretions. It is to be differentiated from cases of mastitis caused 
primarily by some injury, and the infectious mastitis caused by other 
bacteria. This can readily be done from a bacteriological examina- 
tion of the udder secretions. 
Prevention. This disease is spread from the infected to the non- 
infected largely by the hands of the milkers. Recognizing this fact, 
the spread can be stopped by disinfecting the hands (washing in a 
disinfectant) of the milker after each animal. The diseased animals 
should be isolated from the others. It is not a difficult infection to 
control. 
REFERENCES 
1. Brennwarp. Chronische Euterentzindung, Archiv. f. Thierheilk. Bd. X. 
(1848), S. 40. . 
2. Durnors. An enzodty of acute streptococcic mammitis. Jour. Comp. Path. 
and Therap., Vol. XVII (1894), p. 159. 
3. Nocarp et Motierrau. Sur une mammite contagieuse des vaches laitiéres. 
Bulletin de la Société centr. de Méd. rét., 1884, p. 188. Ibid. Ann. de U Institut Pasteur, 
Vol. T (1887), p. 109. 
4. REED AND Warp. The significance of the presence of streptococci in market 
milk. American Medicine, Vol. VII (1903), p. 256. 
5. ZscHOoKKE. Weitere Untersuchungen uber den gelben Galt. Schweizer-Archiv 
fiir Thierheilk, Bd. XXXITX (1897), 5. 145. 
