Abstract
Summary
Mice immunized with endotoxin preparations of Shigella paradysenteriœ Flexner, Salmonella typhimurium and Rhodospirillum rubrum were found to have been protected against the induction of hemorrhage in implanted tumors.
Protection by immunization was found to be about as effective against the induction of tumor hemorrhage when the heterologous organisms were used as when the homologous were used. This finding supports our earlier hypothesis that a common antigenic toxic component is characteristic of gram-negative bacteria generally.
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