Abstract
Mycoplasma hominis was isolated from the upper urinary tract in 7 of 80 patients with acute pyelonephritis and from 0 of 60 patients with noninfectious diseases of the urinary tract, a significant difference. In 4 cases M. hominis was isolated in pure culture, in 1 it was isolated with Ureaplasma urealyticum and in 2 it was isolated with bacteria. U. urealyticum was isolated from the upper urinary tract of 5 patients, all with acute pyelonephritis; this was not significantly different from the control group.