Classification of the Hemolyttc Streptococci by the Precipitin Reaction

Streptococcal Teichoic Acid

Teichoic acid-like material extracted by cold trichloroacetic acid from lyophilized whole cells of streptococci from groups A, D, E, 0, and T was shown to give a positive precipitin reaction with group antisera. Similar material from cells of groups B, C, F, G, H, K, L, M, N, P, Q, R, and S did not give a positive reaction with group antisera. The group A material also reacted with anti-E serum...

The Occurrence of Polyglycerophosphate as an Antigenic Component of Various Gram-positive Bacterial Species

A bacterial substance has been described which gives a precipitin reaction with certain antisera to Group A streptococci. The precipitating antigen is present in various Gram-positive bacteria, including most hemolytic streptococci, staphylococci, and aerobic sporulating bacilli. It is not present in any of the Gram-negative species examined or in pneumococci, clostridia, or corynebacteria. Ana...

New Approaches for the Laboratory Recognition of M Types of Group a Streptococci

The successful classification of Group A streptococci by the capillary precipitin technique requires a complete series of M type antisera which are sufficiently potent and specific to give unequivocal type-specific reactions with all the serotypes. Specific antisera for this purpose have been prepared by absorption with heterologous streptococci. Unabsorbed antisera have been employed here in t...

The quantitative precipitin reaction of type 19 M protein antigen of group A streptococci and antistreptococcal rabbit sera.

New Method of Preparing Immunizing Antigens for the Production of Anti-m Sera against Certain Serotypes of Group a Streptococci.

Ashworth, Helen (Communicable Disease Center, Atlanta, Ga.), and William K. Harrell. New method of preparing immunizing antigens for the production of anti-M sera against certain serotypes of group A streptococci. J. Bacteriol. 89:141-145. 1965.-Antisera against types 4, 29, 41, and 46 streptococci have been prepared by use of a vaccine killed by adjusting the pH to 11.7 and heating for 1 hr at...