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.

    19/28 (page 507)
    The same test applied to the mouth cultures would show that almost any individual culture could be included in the feces group. However, almost any mouth culture would be an exceptional, not a typical, feces culture. A culture fermenting saccharose, lactose, raffinose, and mannite could be either from the mouth or from feces, but there is a high proba¬ bility that it would be of buccal origin. On the other hand, a culture fermenting saccharose, lactose, raffinose, and starch, but failing to fer¬ ment mannite or glycerin, would almost certainly be of fecal origin. RELATION OF THESE GROUPS TO NAMED VARIETIES It would be difficult to identify all of these groups with previously described species. Until the work of Gordon, few cultures were described Fig. 8.—Diagram showing a possible grouping of the milk cultures of streptococci. on the basis of the fermentation of a large number of test substances, and in only a very few cases have the cultures been obtained from a definite source. An exception may be made of the pathogenic bacteria in which the cultures described have been selected from definite and very similar sources. Among the streptococci we have an example in the pus-forming organism generally described as Streptococcus pyogenes. In Table VIII are compiled the typical reactions given for Streptococcus pyogenes by three investigations. The reactions given by Andrewes and Horder are compiled from a large number of cultures, and those given by Gordon are from a number of his own cultures.1 Those given by Bergey are the reactions of a comparatively few typical cultures.2 So 1 Andrewes, F. W., and Horder, T. J., A study of the streptococci pathogenic for man. Lancet, v. 2, no. 11, p. 708-713; no. 12, p. 775-782; no. 13, p. 852-855. 1906. Gordon, M. H. Report on an investigation of the fermentative characters of streptococci present on fauces during scarlet fever. 40th Ann. Rpt. Local Govt. Bd. [Gt. Brit.], 1910-n, Suppl. Rpt. Med. Off., p.302-31, 1911. s Bergey, D.H. Differentiation of cultures of streptococcus. Jour. Med. Research, v. 27 (n. s., v. 12), no. 1, p. 67-77. 1912.