Protozoa

Question 1

Entamoeba histolytica & disparr

Answer 1

Only histolytica is pathogenic
Cyst and trophozoits
Dysenteria, bloody diarrhae
Lectin0mediated adherence, poreforming protein, small mucosal ulcerations
Microscopy of feces, serology

Question 2

Toxoplasma gondii

Answer 2

Oocyst, tachyzoite and tissue cysts
toxoplasmosis: lymphadenopahty, congenital infection of infants
Sporozoites invade macrophages
Serology, microscopy

Question 3

Plasmodium vivax & falciparum

Answer 3

Only falciparum is lethal
Sporozoa, ring forms, throphozoits, schizonts, gametocytes
Adherence to erythrocytes, capillary obstruction by schizonts
Malaria, fever, anemia
Thick and thin blood smears

Question 4

Giardia lamblia

Answer 4

Cyst and trophozoite stage
Intestinal infection, diarrhae with foul smelling greasy stools, abdominal pain
Cysts, malabsorption, atrophy mucosa
Microscopy of stool