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Royal Society of Tropical Medicine and Hygiene Meeting at Manson House, London, 19 May 1994. Trypanosomiasis and the nervous system. Pathology and immunology.

Damage to the nervous system occurs in both African and American trypanosomiases, but it differs considerably in form and extent in each disease, and with different strains and disease stages. With Trypanosoma brucei infections there is a progressive central nervous system (CNS) pathology which involves the meninges, choroid, blood-brain barrier, and immunopathological changes including perivascular infiltrations, astrocyte activation and alterations in the cytokine/mediator network. These changes underly the altered behaviour in the late or secondary disease stages, prevalent in the chronic gambian form, characterized by hypersomnia leading, if untreated or if treatment is followed by reactive changes, to coma and death. T. cruzi infections can be divided into 3 stages; acute, intermediate and chronic. Each stage has a different neurological involvement. In the acute stage the parasite produces direct destructive and inflammatory changes in the CNS which can be life-threatening, but which normally resolve, giving way to an intermediate period with effective parasite suppression and little or no perpetuation in the nervous system. The chronic stage is characterized by alteration to a progressive peripheral neuroimmunopathology, with autoimmune destruction of many nerve components, especially the autonomic innervation of the heart and gut.

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