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As with many other helminths, the infection is associated with immunomodulatory effects, which could affect other inflammatory conditions including autoimmune and allergic diseases. Here, we investigated the effect of<jats:italic>T. canis<\/jats:italic>infection on the course of experimental autoimmune encephalomyelitis (EAE), an animal model of multiple sclerosis. Mice infected with 2 doses of 100<jats:italic>T. canis<\/jats:italic>L3 larvae 5 weeks prior to EAE induction (the<jats:italic>Tc<\/jats:italic>+EAE group) showed higher EAE clinical scores and greater weight loss compared to the non-infected group with induced EAE (the EAE group). Elevated concentrations of all measured serum cytokines (IL-1<jats:italic>\u03b1<\/jats:italic>, IL-2, IL-4, IL-6, IL-10, IL-17A, IFN-<jats:italic>\u03b3<\/jats:italic>and TNF-<jats:italic>\u03b1<\/jats:italic>) were observed in the<jats:italic>Tc<\/jats:italic>+EAE group compared to the EAE group. In the CNS, the similar number of regulatory T cells (Tregs; CD4+FoxP3+Helios+) but their decreased proportion from total CD4+ cells was found in the<jats:italic>Tc<\/jats:italic>+EAE group compared to the EAE group. This could indicate that the group<jats:italic>Tc<\/jats:italic>+EAE harboured significantly more CD4+ T cells of non-Treg phenotype within the affected CNS. Altogether, our results demonstrate that infection of mice with<jats:italic>T. canis<\/jats:italic>worsens the course of subsequently induced EAE. Further studies are, therefore, urgently needed to reveal the underlying pathological mechanisms and to investigate possible risks for the human population, in which exposure to<jats:italic>T. canis<\/jats:italic>is frequent.<\/jats:p>","DOI":"10.1017\/s0031182022001238","type":"journal-article","created":{"date-parts":[[2022,9,2]],"date-time":"2022-09-02T03:47:07Z","timestamp":1662090427000},"page":"1720-1728","update-policy":"https:\/\/doi.org\/10.1017\/policypage","source":"Crossref","is-referenced-by-count":8,"title":["<i>Toxocara canis<\/i>infection worsens the course of experimental autoimmune encephalomyelitis in 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