Ecological Niches in the Human Body: 6 Bloodstream Plasmodium Trypanosoma 7. Spleen: Leishmania 8. Liver: leishmania. Entamoe ba 9. Muscle: Trypanosoma cruzi 10. central nervous system: Trypanosoma, Naegleria, Toxoplasma, PlasmodiumEcological Niches in the Human Body: ▪ 6. Bloodstream: Plasmodium, ▪ Trypanosoma ▪ 7. Spleen: Leishmania ▪ 8. Liver: Leishmania, Entamoeba ▪ 9. Muscle: Trypanosoma cruzi ▪ 10. central nervous system : Trypanosoma, Naegleria, Toxoplasma, Plasmodium