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Introduction

Protozoa are motile, single-celled organisms that occur worldwide. Many of those that cause extraintestinal infections are transmitted by arthropod vectors. These infections include African trypanosomiasis, Chagas disease, leishmaniasis, and malaria. Toxoplasmosis is acquired through contaminated food. Free-living amebas are acquired through contact with surface water or soil.

Last full review/revision December 2009 by Richard D. Pearson, MD

Content last modified December 2009

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