Monoclonal antibodies (MCA) to streptococcal group A polysaccharide (A-PS) were prepared. Precipitating MCA are directed to the determinant common for A-PS and streptococcal group L polysaccharide (L-PS). The antibodies react in the immunodiffusion test and give identity reaction in A- and L-PS tests. Other MCA are non-precipitating but react with A-PS studied by immunoenzyme method. The reasons for the formation of precipitating and non-precipitating MCA to different antigenic determinants of A-PS are discussed.
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