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Free-living Amebic Infections
[Acanthamoeba spp.] [Balamuthia mandrillaris] [Naegleria fowleri] [Sappinia spp.]

Trophozoites of Balamuthia mandrillaris are pleomorphic and measure approximately 15-60 µm.  They often produce long, slender pseudopodia. Trophozoites contain a large nucleus with a large, centrally-located karyosome but no peripheral chromatin.  There is no flagellated trophozoite stage as in Naegleria spp.

B. mandrillaris trophozoite in culture B. mandrillaris trophozoite in culture
A

B

A, B: Trophozoites of B. mandrillaris in culture.

B. mandrillaris trophozoite in culture B. mandrillaris trophozoite in culture
C

D

C, D: Trophozoites of B. mandrillaris in culture.

 
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