EN
CFW strain white mice were infected with various doses (10, 30, 50 and 100) of Fasciola hepatica metacercariae administered per os. Using histochemical methods, the activity of selected oxidoreductases (α-glycerophosphate dehydrogenase, isocitrate dehydrogenase, succinate dehydrogenase, and cytochrome oxidase) was evaluated in the liver of the mice suffering from acute and chronic fasciolosis. Intensified anaerobic and aerobic respiration was recorded. The host’s compensatory mechanism observed in the form of intensified metabolism, was found to be related to the infection intensity.