Abstract
The worms caused mild epithelial damage and were lying upon, or partially embedded in the epithelium and submucosa of the urinary bladder, and occasionally in the lower part of the medullary collecting tubules or in the urinary pelvic cavity, with associated papillitis and pyelonephritis. The incidence of urinary nematodiasis in these young caesarian-derived but conventionally-bred rats was high (66%).