AN ASSAY METHOD FOR LEUKOCYTE PYROGEN

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Abstract
A method for assaying leukocyte pyrogen is described which is shown to remain valid despite the presence of very large amounts of bacterial endotoxin. It uses a combination of two procedures to inactivate endotoxin: incubation in normal rabbit plasma for 24 hr at 37°C, and injection into rabbits rendered refractory to endotoxin. The validity of the assay was confirmed by formal statistical methods. A simplified assay method is also described which lacks full statistical validity, but is more suitable for routine use.

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