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Primary Amebic Meningoencephalitis |
PAM |
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Histopathology of primary amebic meningoencephalitis caused by Naegleria fowleri viewed under direct fluorescent
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Naegleria fowleri is a the cause of primary amebic meningoencephalitis This is a brain disorder that is almost invariably fatal resulting from the invasion of the brain by this
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weeks to months to death Acanthamoeba can also cause skin lesions as well as keratitis and corneal ulcers following corneal injury or in association with contact lenses Figure 1 Differentiating between N fowleri and Acanthamoeba N fowleri trophozoites are small amoeba which move by producing smooth hemispherical bulges Cysts are usually
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karyosome The amebae are very active and extend and retract pseudopods Trichrome stain From a patient who died from primary amebic meningoencephalitis in Virginia CDC Figure 25B Naegleria fowleri trophozoite in spinal fluid Trichrome stain Note the typically large karyosome and the monopodial locomotion Image
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rest of the central nervous system CNS Respiratory symptoms in some patients may be the result of hypersensitivity or allergic reactions or may represent a subclinical infection Figure 81 2 Pathogenesis of Naegleria infection The brain of a patient with primary amebic meningoencephalitis usually shows swollen edematous congested cerebral hemispheres
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