A vaccine containing Clostridium perfringens (Cl. welchii) b -toxoid is characterized in that it contains as preservative one or more organic mercurial antiseptics and not phenol or a similar antiseptic. Specified are sodium o-ethylmercurithiobenzoate and phenylmercuric salts, e.g. nitrate. Not only is the growth of contaminants prevented but the antigen is stabilized or preserved.
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