Question 1

Which of the following best explains why Trypanosoma brucei infections are difficult for the host immune system to clear?

Accepted Answer

It constantly changes its surface glycoproteins, evading immune detection.

Question 2

A patient in Central America presents with chagomas and heart failure. Which organism is most likely responsible for these symptoms?

Accepted Answer

Trypanosoma cruzi

Question 3

Which diagnostic method involves allowing uninfected kissing bugs to feed on a patient and then examining the bugs for parasites?

Accepted Answer

Xenodiagnosis

Question 4

Which stage of Chagas' disease is characterized by the formation of pseudocysts and congestive heart failure?

Accepted Answer

Symptomatic stage

Question 5

What is the primary vector for Trypanosoma cruzi transmission?

Accepted Answer

Triatoma (kissing bug)

Question 6

Which of the following is NOT a recommended prevention strategy for African sleeping sickness?

Accepted Answer

Vaccination against Trypanosoma brucei

Question 7

Leishmania promastigotes develop extracellularly within the gut of which vector?

Accepted Answer

Sand fly

Question 8

Which clinical form of leishmaniasis is most likely to be fatal if untreated?

Accepted Answer

Visceral leishmaniasis

Question 9

Which of the following protozoans is transmitted via fecal-oral route and causes dysentery?

Accepted Answer

Balantidium coli

Question 10

A patient presents with fever, lymph node swelling, and headaches after a bite in Africa. Which organism is most likely responsible?

Accepted Answer

Trypanosoma brucei

Question 11

Which protozoan parasite is known for causing cyclical waves of parasitemia due to antigenic variation?

Accepted Answer

Trypanosoma brucei

Question 12

Which treatment is used for visceral leishmaniasis?

Accepted Answer

Amphotericin B

Question 13

Which equation best represents the exponential growth of protozoan parasites in a host, assuming no immune response?

Accepted Answer

$$N(t) = N_0$ e$$^{rt}$$

Question 14

Which protozoan is an apicomplexan and is the causative agent of malaria?

Accepted Answer

Plasmodium spp.

Question 15

Which of the following is a virulence factor of Plasmodium that helps it evade immune clearance in the spleen?

Accepted Answer

Adhesins

Question 16

Acanthamoeba spp. can cause ulcerative keratitis. What is the most common mode of transmission?

Accepted Answer

Contact

Question 17

Which protozoan parasite is transmitted by Anopheles mosquitoes and is endemic throughout the tropics and subtropics?

Accepted Answer

Plasmodium spp.

Question 18

Which of the following statements about apicomplexans is correct?

Accepted Answer

They are intracellular pathogens and reproduce by schizogony.

Question 19

Which protozoan parasite is most likely to cause amebic meningoencephalitis following inhalation of contaminated water?

Accepted Answer

Naegleria

Question 20

Which of the following is a common host organism for Leishmania spp.?

Accepted Answer

Canines and rodents

Parasitic Protozoa, Helminths, and Arthropod Vectors: Key Human Pathogens and Their Diseases

Study Guide - Practice Questions