The origin of some of the streptococci found in milk / by L.A. Rogers and Arnold O. Dahlberg, Dairy Division, Bureau of Animal Industry.

  • Rogers, L. A. (Lore Alford), 1875-1975
Date:
[1914?]
Catalogue details

Licence: In copyright

Credit: The origin of some of the streptococci found in milk / by L.A. Rogers and Arnold O. Dahlberg, Dairy Division, Bureau of Animal Industry. Source: Wellcome Collection.

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    far as it is possible to make comparisons, the reactions given agree very closely with our nonliquefying udder cultures. Table VIII.—Results of fermentation tests of Streptococcus pyogenes described in the literature. Authority. Saccharose. Lactose. 6 in . O 1 $ Starch. Inulin. Mannite. Glycerin. Salicin. Coniferin. Our nonliquefying udder cultures.. .per cent.. Andrewes and Horder. ?6 + + + 93 + + + 0 4 1 1 1 16 ± 16 1 H-H- — Gordon... Bergey. A still further comparison is possible by the tabulation of the fermen¬ tation reactions of five typical cultures of Streptococcus pyogenes obtained through the courtesy of Prof. C. E. A. Winslow, of the American Museum of Natural History. These results are given in Table IX. Although some of these cultures have been grown on artificial media for many years, they still exhibit the same general characters as our freshly isolated udder cultures—namely, an ability to ferment dextrose, saccharose, and lactose, general failure to ferment raffinose and the polysaccharids, and an erratic tendency to ferment the alcohols. Unfortunately the gelatin test was not made on these five cultures. The fermentation of glycerin by three of the five indicates that they may have been of the liquefying type. Savage in 176 cultures of streptococci isolated from cases of mastitis found that 95 per cent liquefied gelatin.1 His cultures differed from both the typical S. pyogenes and our liquefying cultures in that 49 per cent fermented raffinose. Table IX.—Results of fermentation tests of five cultures of Streptococcus pyogenes from American Museum of Natural History (New York) collection. Source. Dextrose. Saccharose. Lactose. Raffinose. Starch. Inulin. Mannite. Glycerin. New York Post Graduate Medical College (fatal sep¬ ticemia) . 3-S»o 3-85 3.60 0.20 0.18 0.23 0.35 0.59 Dr. Bien, Chicago. Ill. (abscess in erysipelas). 5- 45 4- 7s 3- 25 0 • 13 • 18 2.55 2.34 Boston Board of Health (urine). 3.8s 4-05 •45 0 3-98 0 0 1.74 Johns Hopkins Universitv. 6. 45 4. 95 4- 70 . 20 •45 .08 4-91 1.67 Michigan Agricultural College. 2.50 0 I-15 .05 0 • 09 •23 .19 VARIATION FROM TYPE IN THE UDDER ORGANISMS The trouble from infected udders at both the Beltsville and Annapolis farms was in the nature of an epidemic. The infection apparently spread from cow to cow and became so severe that at Annapolis one or 1 Savage. W. G., Report upon the bacteriology and pathology of “Garget” Cor mastitis) in cows. 37th Ann. Rept. Local Govt. Bd. [Gt. Brit.], 1907-8. Suppl. Rept. Med. Off., pp. 359-424. 1909.