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Other Human Amoebae

Other Human Amoebae. Entamoeba dispar/E. hartmanni : Non pathogenic; anatomically indistinguishable from E. histolytica. Entamoeba coli. Trophozoite Cyst Nucleus . Entamoeba coli. Life cycle and location identical to E. histolytica .

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Other Human Amoebae

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  1. Other Human Amoebae • Entamoeba dispar/E. hartmanni: Non pathogenic; anatomically indistinguishable from E. histolytica.

  2. Entamoeba coli Trophozoite Cyst Nucleus

  3. Entamoeba coli • Life cycle and location identical to E. histolytica.

  4. Entamoeba coli • Life cycle and location identical to E. histolytica. • Most common endocommensal in people; has a worldwide distribution and 10-50% of the population can be infected in different parts of the world.

  5. Entamoeba coli • Life cycle and location identical to E. histolytica. • Most common endocommensal in people; has a worldwide distribution and 10-50% of the population can be infected in different parts of the world. • Not pathogenic.

  6. Entamoeba coli • Life cycle and location identical to E. histolytica. • Most common endocommensal in people; has a worldwide distribution and 10-50% of the population can be infected in different parts of the world. • Not pathogenic. • Feeds on bacteria and any other cells available to it; does not invade tissue.

  7. Other Hosts Monkeys Apes Pigs

  8. 10 mm Trophozoites 20-30 μm in diameter (15-50 µm)

  9. A B C D 10 mm

  10. E. coli E. histolytica A B C D 10 mm

  11. C Cysts 10-30 μm 10 mm

  12. Entamoeba gingivalis Habitat: Mouth Hosts: Humans, other primates, dogs and cats. Prevalence is from 50 to 95%. Stage: Trophozoite, no cyst.

  13. Entamoeba gingivalis Trophozoite lives on the surface of teeth and gums. Feed on epithelial cells of the mouth, bacteria, food debris, and other cells available to them.

  14. Entamoeba gingivalis Trophozoite lives on the surface of teeth and gums. Feed on epithelial cells of the mouth, bacteria, food debris, and other cells available to them. Organisms are more common in persons with pyorrhea (gum disease) but they are not the cause of the condition.

  15. Entamoeba gingivalis Trophozoite lives on the surface of teeth and gums. Feed on epithelial cells of the mouth, bacteria, food debris, and other cells available to them. Organisms are more common in persons with pyorrhea (gum disease) but they are not the cause of the condition. Transmission mouth to mouth, droplet spray, or sharing eating utensils.

  16. Endolimax nana “The dwarf internal slug” Trophozoite Cyst Nucleus

  17. Endolimax nana • Second most common endocommensal of humans, worldwide distribution 30%.

  18. Endolimax nana • Second most common endocommensal of humans, worldwide distribution 30%. • Lives in the large intestine mainly near the cecum and feed on bacteria; non pathogenic.

  19. Endolimax nana • Second most common endocommensal of humans, worldwide distribution 30%. • Lives in the large intestine mainly near the cecum and feed on bacteria; non pathogenic. • Also occurs in monkeys.

  20. Trophozoites are tiny 6-15 μm in diameter. Large glycogen vacuoles are often present. 10 mm

  21. Mature cyst is 5 – 14 μm in diameter; contains 4 nuclei; shape is round to elliptical 10 mm

  22. Iodamoeba buetschlii Trophozoite Cyst Nucleus

  23. Iodamoeba buetschlii • Not very common endocommensal in people.

  24. Iodamoeba buetschlii • Not very common endocommensal in people. • Lives in the large intestine, predominantly in the cecal areas.

  25. Iodamoeba buetschlii • Not very common endocommensal in people. • Lives in the large intestine, predominantly in the cecal areas. • Has a very high prevalence in pigs; 50% of pigs are infected with this ameba in France and Egypt; pigs are probably its normal host.

  26. Trophozoites are 9-14 μm long but may be as large as 20μm 10 mm

  27. 10 mm

  28. E. nana 10 mm I. buetschlii

  29. Cysts are 6-15 µm long and have a large glycogen vacuole. 10 mm

  30. Dientamoeba fragilis Trophozoite No Cyst Nucleus

  31. Dientamoeba fragilis • LIFE CYCLE - it does not form cysts and trophozoites cannot survive passage through the small intestine.

  32. Dientamoeba fragilis • LIFE CYCLE - it does not form cysts and trophozoites cannot survive passage through the small intestine. • Humans probably get infected by this endocommensal when they ingest pinworm eggs!

  33. Trophozoites small 6-12 µm long; binucleated. 10 mm

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