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Immunization with purified M protein, a component of the group A streptococcal cell wall, induces the formation of circulating antibody and delayed cutaneous hypersensitivity (DCH). The specificity of these responses was evaluated in guinea pigs and man, using types 1, 3, 6 and 12 M protein. In a study of 10 human adults, delayed hypersensitivity and circulating antibody to more than one M protein was usually present. In several individuals, in vitro cellular reactivity to several M proteinsdoi:10.4049/jimmunol.105.4.898 fatcat:em4o5e5iy5c65k6r7hhas7pmre