FACTORS RELATING TO THE VIRULENCE OF STAPHYLOCOCCI

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Abstract
The typical febrile response of normal rabbits given bacterial endotoxin intravenously may be modified by prior administration of plasma or, less effectively, serum of endotoxin-tolerant donors. This altered response is characterized by disappearance of the second rise in fever and by a striking reduction in fever index. It thus resembles the course of fever shown by rabbits made tolerant to endotoxin by one or more previous daily doses. This transfer of tolerance by plasma or serum depends critically upon the manner in which tolerance is induced in the donors.