Author information RTC-Research Toxicology Centre S.p.A., Pomezia, Rome, Italy. enrico.vezzali@tin.it Abstract The Göttingen minipig is one of the nonrodent species recommended by various regulatory authorities for safety assessment of drugs in preclinical studies. In such studies, knowledge of background pathology is critical in order to evaluate the potential renal toxicity. In the present study, the authors report 4 cases of glomerulonephritis out of 154 microbiologically