Protozoans (from Greek πρῶτον proton "first" and ζῷα zoa "animals"; singular protozoon) are microorganisms classified as unicellular eukaryotes.
protozoan (prō'təzō`ən), informal term for the unicellular heterotrophs of the kingdom Protista Protista (prōtĭs`tə) or Protoctista..... Click the link for more information.
These parasites infect the intestinal tract of man and animals.
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