Abstract
A ribosomal preparation isolated from group A, type 14 Streptococcus pyogenes protected mice against a challenge of 1,000 mean lethal doses. Optimal immunization consisted of subcutaneous administration of 326 mug of protein with Freund incomplete adjuvant. Animals immunized with higher or lower antigen concentrations showed decreased survival. Freund incomplete adjuvant was necessary to insure optimum immunization. Immunochemical studies showed no M protein or C carbohydrate present in the ribosomal preparation. Mice optimally immunized with the type 14 ribosomal preparation were protected against heterologous challenge with M types 2, 5, 8, and 12. Protein-free ribonucleic acid extracts isolated from the type 14 ribosomal preparation did not protect mice against homologous challenge. But ribonucleic acid-free protein extracts showed 100% protection in mice after homologous challenge.
MeSH Terms
Animals
Bacterial Vaccines/isolation & purification
Blood/microbiology
Centrifugation, Density Gradient
Electrophoresis, Polyacrylamide Gel
Immunization
Immunodiffusion
Mice
RNA, Ribosomal/isolation & purification
Ribosomal Proteins/isolation & purification
Spleen/microbiology
Streptococcus pyogenes/immunology
Ultracentrifugation
Chemicals
Bacterial Vaccines
RNA, Ribosomal
Ribosomal Proteins
Authors & Affiliations
2 authors, click to expand affiliations / ORCID
Schalla W O
Johnson W
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