The effect of Shwartzman phenomenon on the pathogenesis of experimental acute pyelonephritis in rat.

It has been shown that the mere presence of gram-negative bacteria within the kidney parenchyma does not lead to kidney damage. Various accessory manipulations modifying the resistance of the urinary tract should be used to induce kidney lesions. We present the results of our experiments with sterile bacterial filtrate applied accordingly to the technique of Shwartzman phenomenon. This way we produced experimental acute pyelonephritis in rats by an ascending route of infection. A significant pathogenic activity of sterile bacterial filtrate in comparison with saline was shown producing clinically relevant infections of the urinary tract in rats infected by concentrations of E. coli suspensions of 10(4) and 10(5) cfu/ml.