Infectious Disease Online
Cutaneous Infections and Infestations:
The protozoa are single celled organisms of great medical importance.
I Amebae: Amebae are single celled organisms with trophozoite and cyst stages in the life cycle.
Acanthamebiasis - Pustular, chronic ulcerating nodular lesions are present in the skin.
Histologically, there is a dense acute inflammatory infiltrate with focal abscess formation together with numerous organisms (amoebae, 15 - 40 micrometer in width).
Tuberculoid granulomatous lesion together with vasculitis may be present in the deep dermis and subcutis.
II Flagellates: The flagellates are a group of protozoa that moves by flagella.
Coccidia are important in immunocompromised patients , have asexual and sexual cycles, and are acquired from contaminated food or water.
Pneumocystosis : Cutaneous pneumocystosis is rarely noted in patients with AIDS
(Visit: Cutaneous lesion associated with AIDS )
There are foamy, amphophilic material around blood vessels.
Methenamine silver stain reveals small cysts characteristic of Pneumocystis carinii.
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