Available evidence supports the hypothesis that Toxoplasma gondii infection helps protect against the development of multiple sclerosis


Background and purpose: According to the hygiene hypothesis, infections by agents such as parasites have a protective role against the risk of developing multiple sclerosis (MS). Among parasites, Toxoplasma gondii, an intracellular parasite, showed evidence of a protective effect. This study was undertaken to summarize the available evidence on the association between T. gondii infection and MS.