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Role of gram-negative sepsis in lethal toxicity induced by Mycoplasma.

The role of gram-negative bacteria in lethal toxicity induced by mycoplasmas in mice was examined. Attempts to isolate significant numbers of walled bacterial forms from the blood and peritoneal cavity of mice given injections of > 1010 cfu of Mycoplasma fermentans, strain K10, failed. The limulus amebocyte lysatecoagulation test also failed to detect a positive endotoxemia, although some nonspecific reactions or false-positive results were noted when concentrated suspensions of Mycoplasma were tested. M. fermentans, strain K10, was capable of inducing the signs and histopathology normally associated with lethal toxicity in germ-free mice. These data support the conclusion that lethal toxicity in mice includes some of the same biological responses seen in endotoxic shock, but the condition is actually a distinct experimental disease caused by infection with Mycoplasma.