Types of Hemolytic Streptococci in Certified Milk

The milk from about 1,000 cows on 5 different certified farms has been plated on blood agar about once a month throughout the period of 1½ years. The samples were from groups of 10 cows. Hemolytic streptococci of the true beta type appeared in 28.6% of the samples. The number of such streptococci in...

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Bibliographic Details
Published in:The Journal of infectious diseases 1927-06, Vol.40 (6), p.698-705
Main Authors: Frost, William D., Gumm, Mildred, Thomas, Robert C.
Format: Article
Language:English
Subjects:
Blood
Cultural groups
Herds
Infections
Milk
Milking
Sodium
Streptococcus
Streptococcus pyogenes
Udders
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Summary:The milk from about 1,000 cows on 5 different certified farms has been plated on blood agar about once a month throughout the period of 1½ years. The samples were from groups of 10 cows. Hemolytic streptococci of the true beta type appeared in 28.6% of the samples. The number of such streptococci in the samples were usually very small, less than 1,000 per cc. in 65%, and less than 10,000 per cc. in 94% of the samples. Classification of 394 cultures of the beta type, by means of 7 different tests, placed them in 6 different species. Five of these, the been described before. One new species is described, Streptococcus asalignus. All of the strptoccoci found in certified milk, and identified, are of the bovine type with exception of 4 cultures which proved to be Streptococcus epidemicus Davis. The method of procedure used in this work fro examining milk and identifying streptococcus promises to be of dictinct value in the production of milk of the highest quality.
ISSN:0022-1899
1537-6613
DOI:10.1093/infdis/40.6.698