Aspirin profoundly inhibited the in vitro augmentation of human and mouse granulocyte adherence to nylon fiber induced by the bacterial products Escherichia coli endotoxin and Staphylococcus aureus culture filtrate. Granulocytes obtained from normal volunteers during the 48 hr following ingestion of aspirin did not respond normally to endotoxin stimulation. Furthermore, pretreatment of mice with sodium salicylate prior to intraperitoneal infection with Streptococcus pneumoniae impaired granulocyte exudation and resulted in uncontrolled bacteremia and greater lethality of infection.

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