Introduction. Parasitic diseases continue to affect the population of many countries of the world. About 2 billion people on the planet are infected with helminths, including Toxocara canis. Invasion with Toxocara canis represents a strong endogenous factor in the formation of the regulatory imbalance of the immune system. The integral evaluation of these indices serves as an important criterion in the diagnosis of toxocarosis and the effectiveness of the applied therapy. In the context of the above, information about research on immune reactivity and natural resistance of tuberculosis patients in association with toxocariasis is of interest. Material and methods. This article is a systematic review of the relevant literature between the year 2001 and 2022. The material for the study was electronic sources published through the web Medline, EMBASE, Global Health, Scopus and Web of science; PubMed; crossref; Google Scholar and others. The following keywords were used “immunological reactivity”, “natural resistance”, “parasitic diseases”, “toxocara canis”, “tuberculosis and toxocariasis”, “immunity”, “helminthiasis”, “toxocariasis”. Bibliographic resources have been systematized by subject and content. The results were grouped and systematized according to the relevant criteria and the level of scientific evidence. Results. Parasites, in particular, Toxocara canis and M. tuberculosis use different mechanisms to alter the immune response, but these mechanisms can interact with significant consequences for the immunological reactivity of each infection. Chronic helminthic infection causes a wide range of changes in the immune system. Conclusion. The immune reactivity and natural resistance of tuberculosis patients in association with toxocarosis is insufficiently elucidated.