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A single-cell organism that can only divide within a host organism. Malaria is caused by a protozoa: Plasmodium. Other protozoan parasites Giardia and Toxoplasma. Example, Giardia intestinalis, also known as Giardia lamblia causes diarrhea, abdominal pain, upset stomach, mucusy stools, and nausea.
What is Protozoa