The immune system plays a crucial role in maintaining the body's homeostasis, determining the state of health of animals and their ability to adapt. The work aimed to investigate the effect of a feed additive based on milk thistle fruits, selenium, metiphene, and vitamins A, E, and C on rats' immune status under experimental tetrachloromethane poisoning conditions. The study was conducted on young white male Wistar laboratory rats. Intragastric administration of tetrachloromethane twice (with an interval of 48 hours) in a dose of 0.1 ml per 100 g of body weight in a 50 % oil solution was used for the experimental intoxication of rats. The animals of the second experimental group were fed the feed additive “Sylimevit” for 30 days together with feed at a dose of 0.1 g per 100 g of body weight. The introduction of tetrachloromethane in experimental groups of rats led to the development of oxidative stress, which occurs due to specific chemical processes in the body of experimental animals. It was found that the development of oxidative stress caused by tetrachloromethane leads to suppression of the humoral and nonspecific link of the immune system of rats. This is manifested in a decrease in the bactericidal and lysozyme activity of the blood serum, a decrease in the phagocytic index, and the phagocytic activity of neutrophils. In addition, an increase in the number of circulating immune complexes was observed. It was also established that feeding the feed additive “Sylimevit” strengthens the immune defense of the body of rats poisoned with tetrachloromethane. This feed additive helps to strengthen the body's defense mechanisms, increasing
the immune response and helping to resist the toxic effects of tetrachloromethane.

Modern aspects of the pathogenesis of acute inflammation of the peritoneum that is concurrent with diabetes involves analysis of metabolic mechanisms, in particular peroxidaton of proteins – antioxidant defense. Therefore, the objective of our study was to examine the interrelation between the processes of free-radical oxidation of proteins and antioxidant system in the dynamics of development of acute generalized peritonitis against the background of streptozotocin-induced diabetes. The study was performed on 56 non-linear white mature male rats. Diabetes mellitus was modeled by a single intraperitoneal injection of streptozotocin (60 mg/kg). On the 14th day of the development of streptozotocin-induced diabetes, we injected 10% filtrated faeces suspension (0.5 mL) into the abdominal cavity, thus initiating acute generalized peritonitis. Oxidative modification of proteins in blood serum was studied using the I. F. Meshchyshen’s method and the condition of antioxidant protection was monitored according to the activities of superoxide dismutase, catalase, content of reduced glutathione, and the level of ceruloplasmin.
The study of the parameters of free-radical oxidation of proteins and study of the condition of antioxidant system in
blood of the rats with experimental acute generalized peritonitis against the background of streptozotocin-induced diabetes demonstrated that oxidative protein modification grew, while the parameters of the activity of antioxidant system were being inhibited, depending on the stage of acute inflammation of the peritoneum. We determined inverse correlation relationships between the products of free-radical oxidation of proteins and parameters of antioxidant system on the third and on the seventh days of modelling of combined pathology. Manifestation of acute generalized peritonitis concurring with streptozotocin-induced diabetes was accompanied by a gradual accumulation of the products of free-radical oxidation of proteins and exhaustion of the antioxidant defense during all stages of the development of acute inflammation of the peritoneum, peaking on the seventh day after administration of faecal suspension (terminal stage of peritonitis). The observed inverse correlations between the levels of oxidative modification of proteins and the activity of superoxide dismutase, catalase, reduced glutathione, and ceruloplasmin on
the third and on the seventh days of modelling of combined pathology indicate a predictive role of the processes of free-radical oxidation of proteins in exhaustion of antioxidant-defense resources.