Liq. manure from pig farm was fermented under mesophilic (35 degrees C) and thermophilic (50 degrees C) anaerobic digestion conditions to evaluate the elimination rate of Salmonella Typhimurium introduced into the bioreactor in corn. bacteriolog. carriers. The mesophilic fermentation resulted in an inactivation of the bacteria after 3 weeks. Under thermophilic conditions, no bacteria were found in the manure after 12 h. The significance of differences between the results achieved in both process was confirmed statistically.