UDDER-COLIBACILLOSIS 67 



Five hours after the infection the body temperature 

 was 39.1° C. (102.2° F.). 



On the day after the infection the appetite was dimin- 

 ished and the animal showed constipation. The infected 

 quarter was swollen, firm, red, warm and painful. The 

 quantity of milk was diminished. The reaction of the 

 milk was alkaline. It was yellow, thick and purulent and 

 presented a copious sediment of pus which contained a few 

 colon bacilli. 



Two days after the infection the fever had subsided the 

 milk was yellow, thick and purulent and contained a rich 

 purulent sediment which showed a few colon bacilli. Other 

 conditions were the same. 



Three days after the infection the swelling of the quar- 

 ter had subsided. The quantity of the milk, however, re- 

 mained small. The milk showed a normal appearance but 

 was j^ellow and somewhat flocculent and contained a slight 

 sediment consisting of yellow fibrinous pus containing a 

 few streptococci. Upon cultivation of the sediment by 

 plating a large number of streptococci but no colon bacilli 

 were recovered. 



Four days after the infection the milk was decreasingly 

 less. The milk was of normal appearance but contained a 

 smaller quantity of sediment consisting of yellow fibrinous 

 pus showing few streptococci. It was otherwise as before. 



Sixteen days after the infection this condition was un- 

 changed. The animal was then slaughtered. 



Autopsy, — The infected quarter was slightly swollen 

 and its consistency a little firm. The incision was moist 

 with milk. The lower part of the cut surface even, smooth, 

 grayish-white and firm. The lobuli showed no milk points 

 here. Upon pressure yellow fibrin cylinders were expressed 

 (chronic streptomycosis). 



The virulence of the colon bacillus in this case was 

 somewhat great; the udder had shown a tendency to go 



