Parasitology

Question 1

What protozoa causes bloating, flatulence, foul-smelling, fatty diarrhea often seen in campers/hikers?

Answer 1

Giardia lamblia

Question 2

What protozoa causes bloody diarrhea, liver abscess and RUQ pain with histological finding of flask-shaped ulcer if submucosal abscess of colon ruptures?

Answer 2

Entamoeba histolytica

Question 3

What protozoa causes rapidly fatal meningoencephalitis in patients with history of swimming in freshwater lakes prior to onset of symptoms?

Answer 3

Naegleria fowleri

Question 4

What congenital CNS abnormality is characterized by a classic triad of chorioretinitis, hydrocephalus and intracranial calcifications?

Answer 4

Congenital toxoplasmosis

Question 5

What is the vector of the disease characterized by enlarged lymph nodes, recurring fever, somnolence, coma called African sleeping sickness?

Answer 5

Tsetse fly

Question 6

What vector also called “kissing bug” causes Chagas’ disease characterized by dilated cardiomyopathy, megacolon, megaesophagus?

Answer 6

Reduviid bug

Question 7

What is the causative agent of visceral leishmaniasis (kala-azar)?

Answer 7

Leishmania donovani

Question 8

What is the vector of Leishmania donovani causing a disease characterized by spiking fevers, hepatosplenomegaly, pancytopenia?

Answer 8

Sandfly

Question 9

What protozoa causes severe diarrhea in AIDS patient characterized by cysts on acid-fast stain?

Answer 9

Cryptosporidium

Question 10

What is the most common site of extraintestinal amoebiasis?

Answer 10

Liver (posterior right lobe)

Question 11

True or False:

Bacillary dysentery has gradual onset accompanied by fever and vomiting.

Answer 11

False

Bacillary Dysentery
? acute onset
? (+) fever, vomiting
? watery, bloody
? odorless
? alkaline pH
? many pus cells
? (-) amoebae

Question 12

True or False:

Amoebic dysentery has characteristic bloody, mucoid stools.

Answer 12

True

Amoebic Dysentery
? gradual onset
? (-) fever, vomiting
? bloody, mucoid
? offensive smell
? acid pH
? few pus cells
? (+) motile amoebae

Question 13

What is the infective stage of E. histolytica?

Answer 13

Mature tetranucleated cyst

Question 14

This is the only ciliate that parasitizes man.

Answer 14

Balantidium coli

Question 15

This parasite can cause villous atrophy in the duodenum or jejunum leading to malabsorption, lactose intolerance and steatorrhea.

Answer 15

Giardia lamblia

Question 16

What is the drug of choice in treating Giardia lamblia?

Answer 16

Quinacrine HCl

Question 17

What is the most common parasite found in urine?

Answer 17

Trichomonas vaginalis

Question 18

This parasite is the most common cause of acute vaginitis with yellow-green puruleng discharge in females and is sexually transmitted.

Answer 18

Trichomonas vaginalis