Streptocoecic Mastitis. 5 



Out of 260 animals Trommsdorff found 15.6% affected, Eiilim 

 31.25% out of 16 animals, Eussell and Hoffmann found in 188 sam- 

 ples 50% with " streptococci." Savage found similar values 

 (55%). 



The author examined from April 1, 1907, to November, 1908, 

 1697 samples of milk from individual cows, and found in 348 sam- 

 ples the typical signs of streptococcic mastitis. 



In 1908 and in the following years he has demonstrated : 



1908. No. of animals, 1695. Streptococcic cases 353 



1909. No. of animals, 738. Streptococcic cases 301 



1910. No. of animals, 597. Streptococcic cases 203 



1911. No. of animals, 876. Streptococcic cases 279 



Therefore 20.6; 20.9; 40.6; 34 and 31.8%, respectively, of 

 the animals were found to be affected with streptococcic infections 

 of the udder. 



If the milk of the individual quarters of the affected udder is 

 examined various stages of the affection in the different parts of 

 the udder may frequently be found. Out of 528 quarters of 

 animals with affected udders 276, or 52.2%, showed lesions in 

 individual quarters. 39.2% of the cows had the disease in one quar- 

 ter, 25.9% showed it in two quarters, 18.5% in three quarters, and 

 16.2% in all four quarters. According to Zschokke out of 662 

 affected quarters 193 occurred in one quarter of the animal, 211 

 in two, 109 in three, and 149 in all four quarters. 



The contamination of market milk with the secretions from 

 animals with udder affections is relatively high. 



In spite of the fact that proof of the mixing of milk from 

 affected udders with market milk is possible only in very pro- 

 nounced cases (typical streptococcic chains with characteristics 

 of animal origin), nevertheless the following results, obtained in 

 examinations, demonstrated conclusively that the secretion from 

 quarters affected with streptococcic mastitis had been added to 

 the whole milk: 



1908, in 352 out of 1578 samples=22% 



1909, in 501 out of 1629 samples=40.5% 



1910, in 243 out of 1211 samples=20% 



1911, in 432 out of 1273 samples=33.9% 



The hygienic importance of the affection to the consumers of 

 milk may be illustrated from the following data. 



I. Hoist, in 1894, had the opportunity of examining in Chris- 

 tiania four series of affections of acute gastro-intestinal catarrh. 



I. Four grown persons and four children out of three families in the same 

 street became affected four hours after the drinking of milk which originated upon one 

 farm. Those persons who drank no milk or only that which had been boiled were spared 

 with the exception of a child who became affected, although only slightly, after drinking 

 boiled milk. 



