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The capacity of mycobacteria to enhance the nonspecific resistance of mice to bacterial infections was related to the presence of cord factor. After enzymatic digestion and delipidation, cell walls lost their immunopotentiating activity, which was restored, however, by the addition of cord factor. Cord factor administered alone protected mice effectively against virulent organisms unrelated to mycobacteria. Moreover, although this glycolipid is usually injected as a solution in mineral oil, our data show its effectiveness when administered in metabolizable peanut oil or even as a suspension in water. Since cord factor is a chemically well-defined molecule (6,6'-trehalose dimycolate), this glycolipid should constitute a new and useful tool for the investigation of nonspecific immunity to infection.
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