Lab session 3

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
Trichomonas vaginalis

• Transmitted by sexual contact
• Itching in the area
• Single nucleus
• Bunch of flagella on one end of the cell

6
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

7
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

8
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

9
Balantidium coli

• Cysts are released in the feces
• Contaminated water or food
• Become trophozoites in the intestinal tract
• Dysentery

10
Plasmodiumfalciparum

• Malaria
• Mosquito
• Forms a ring stage in the red blood cell
• Diagnosis is based on the presence of the ring
  stage