Protozoa-Blastocystis
Once thought to be a harmless yeast, Blastocystis hominis a microscopic single-celled protozoal parasite. It behaves like a tiny animal — hunting and gathering other microbes for food—one reason why having a balanced gut flora is important. Healthy gut floras do not support large amounts of parasites. Many protozoa inhabit your gastrointestinal tract and are harmless; others cause disease.