Abstract
The elaboration of type-specific capsular antigens by group B streptococci can be demonstrated by the serum-soft agar technique. Group B streptococci isolated from bovine mastitis, namely, strains 9F, 14Mi, 8Mo, 44B, and 4S, were shown to form diffuse and compact types of colony morphology in serum-soft agar. Immunochemical and chemical analyses of antigens isolated from diffuse and compact colonies of strain 9F indicated that the diffuse-type growth of this strain was due to the elaboration of a galactose-rich surface antigen, whereas the compact 9F strain was devoid of this antigen. Specific 9F antiserum was effective in converting the diffuse 9F colonies of the compact type, indicating the presence of capsular material. Preliminary evidence suggests that the serum-soft agar technique could also be used to determine the antigenic diversity of the surface antigens of group B streptococci, thus providing an effective means of typing those organisms.
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- Kane J. A., Karakawa W. W., Pazur J. H. Glycans from streptococcal cell walls: structural features of a diheteroglycan isolated from the cell wall of Streptococcus bovis. J Immunol. 1972 May;108(5):1218–1226. [PubMed] [Google Scholar]
- McCARTY M., LANCEFIELD R. C. Variation in the group-specific carbohydrate of group A streptococci. I. Immunochemical studies on the carbohydrates of variant strains. J Exp Med. 1955 Jul 1;102(1):11–28. doi: 10.1084/jem.102.1.11. [DOI] [PMC free article] [PubMed] [Google Scholar]
- PATTISON I. H., MATTHEWS P. R., HOWELL D. G. The type classification of group-B streptococci, with special reference to bovine strains apparently lacking in type polysaccharide. J Pathol Bacteriol. 1955 Jan-Apr;69(1-2):51–60. [PubMed] [Google Scholar]
- Romero R., Wilkinson H. W. Identification of group B streptococci by immunofluorescence staining. Appl Microbiol. 1974 Aug;28(2):199–204. doi: 10.1128/am.28.2.199-204.1974. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Tan E. M., Kunkel H. G. Characteristics of a soluble nuclear antigen precipitating with sera of patients with systemic lupus erythematosus. J Immunol. 1966 Mar;96(3):464–471. [PubMed] [Google Scholar]
- Yoshida K. Demonstration of Serologically Different Capsular Types Among Strains of Staphylococcus aureus by the Serum-Soft Agar Technique. Infect Immun. 1971 Apr;3(4):535–539. doi: 10.1128/iai.3.4.535-539.1971. [DOI] [PMC free article] [PubMed] [Google Scholar]