1. Lab session 3

2. Protozoa Eukaryotic Unicellular Two stages Trophozoite
Metabolically active
Motile
In most cases found inside the host

3. Cyst stage
Dormant stage
Most cases found outside the host

4. Entamoeba histolytica
Cysts are released in the feces
Transmitted in contaminated food or water
When the cysts are ingested, they reach intestinal tract
Become trophozoites
They feed on cells lining the intestinal tract
Red blood cells
Dysentery

5. Cyst

6. Trophozoite

7. Trichomonas vaginalis
Transmitted by sexual contact
Itching in the area
Single nucleus
Bunch of flagella on one end of the cell

9. Giardia lamblia Cysts are released in the feces
Contaminated food and water
Cysts transform into trophozoites.
Attach themselves to the intestinal wall and absorb nutrients.
Diarrhea, weight loss

10. Cyst

11. Trophozoite

12. Trypanosoma gambiense
African sleeping sickness
Transmitted by tsetse fly
Injected into the bloodstream
Toxins – damage certain parts of the nervous system.
Confusion, drowsiness, coma, death

14. Trypanosoma cruzi Chagas disease Kissing bug Mexico, South America
Injected into the bloodstream
Toxins damage certain parts of the nervous system
Mega colon, mega esophagus

16. Balantidium coli Cysts are released in the feces
Contaminated water or food
Become trophozoites in the intestinal tract
Dysentery

18. Plasmodium falciparum
Malaria
Mosquito
Forms a ring stage in the red blood cell
Diagnosis is based on the presence of the ring stage