Coloured TEM of cyst of Pneumocystis carinii

Coloured TEM of cyst of Pneumocystis carinii

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Caption: Pneumocystis carinii cyst. Coloured transmission electron mMicrograph of the resistant cyst stage in the life cycle of P. carinii, the single- celled protozoan parasite that causes pneumonia in victims of AIDS (Acquired Immune Deficiency Syndrome). The cyst is bound by a triple-layered cell wall and contains three "nuclear bodies" (blue, yellow in lower half). These nuclear bodies in P. carinii cysts develop into free- living organisms called trophozoites, which infect lung tissue and cause pneumonia. AIDS- related pneumonia is difficult to treat and often fatal. Magnification: x1,500 at 6x7cm size. x5000 at 10x8".

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Keywords: aids, animal, cyst, invertebrate, invertebrates, nature, opportunistic infection, pneumocystis, pneumocystis carinii, pneumonia, protozoa, protozoan, wildlife, zoology

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