Several of the toxic properties of streptococcal mucopeptide have been studied in detail. Intravenous injection of as little as 1 microg of mucopeptide, solubilized by ultrasonic treatment, elicits a reproducible febrile response. Rabbits which are made tolerant to Escherichia coli endotoxin are only partially tolerant to the subsequent injection of streptococcal mucopeptide. Soluble mucopeptid...
