Question 1

Epidemic typhus,spread by lice,is caused by

Accepted Answer

A)   Chlamydophila pneumonia.
B)   Chlamydophila psittaci.
C)   Ehrlichia caffeensis.
D)   Rickettsia prowazekii.
E)   Rickettsia typhi. D

Question 2

Contamination of eating utensils from oral lesions spreads (bejel/pinta/yaws)among children in impoverished areas of the world.

Accepted Answer

bejel

Question 3

The STD characterized by three distinctly different symptomatic stages is the result of infection with

Accepted Answer

A)   Chlamydia trachomatis.
B)   Leptospira interrogans.
C)   Treponema carateum.
D)   Treponema pallidum pallidum.
E)   Treponema pallidum pertenue. D

Question 4

Which of the following statements regarding Ehrlichia is FALSE?

Accepted Answer

A)   It usually causes a spotted rash similar to Rocky Mountain spotted fever.
B)   The organism reproduces inside the host's phagosomes.
C)   It is transmitted by ticks.
D)   It is an emerging infectious disease.
E)   It has three stages: elementary body, initial body, and morula.

Question 5

Campylobacter gastroenteritis is usually caused by ingestion of contaminated poultry.

Accepted Answer

A) True 
 B)False

Question 6

Which of the following is the cause of the STD known as lymphogranuloma venereum?

Accepted Answer

A)   Neisseria gonorrhoeae
B)   Haemophilus ducreyi
C)   Chlamydia trachomatis
D)   Treponema pallidum
E)   Chlamydophila psittaci

Question 7

People who handle birds infected with ________ may develop pneumonia-like disease.

Accepted Answer

A)   Chlamydophila pneumonia
B)   Chlamydophila psittaci
C)   Chlamydia trachomatis
D)   Ehrlichia chaffeensis
E)   Orientia tsutsugamushi

Question 8

Treponema pallidum can be transmitted

Accepted Answer

A)   by contact with infected fomites.
B)   through sexual intercourse.
C)   from an infected mother to her unborn child.
D)   both by contact with infected fomites and through sexual intercourse.
E)   both through sexual intercourse and from an infected mother to her unborn child.

Question 9

The Ixodes tick can infect humans with Borrelia burgdorferi during which stage(s)of its life cycle?

Accepted Answer

A)   only as a larva
B)   only as a nymph
C)   only as an adult
D)   either as a nymph or an adult
E)   either as a larva or a nymph

Question 10

Which of the following is TRUE of spirochetes?

Accepted Answer

A)   they are peritrichous.
B)   they are Gram-positive.
C)   they are able to penetrate a host's tissues.
D)   they are obligate intracellular organisms.
E)   they are pleomorphic.

Question 11

Infection with ________ may result in peptic ulcers and stomach cancer.

Accepted Answer

A)   Campylobacter jejuni
B)   Helicobacter pylori
C)   Borrelia recurrentis
D)   Vibrio parahaemolyticus
E)   Rickettsia rickettsii

Question 12

Leptospira interrogans exits the body in (feces/aerosols/urine).

Accepted Answer

The answer of Leptospira interrogans exits the body in (feces/aerosols/urine)....

Question 13

Which of the following is the correct sequence for stages of Ehrlichia development in infected host cells?

Accepted Answer

A)   initial body, morula, elementary body
B)   morula, elementary body, initial body
C)   initial body, elementary body, morula
D)   elementary body, initial body, morula
E)   morula, initial body, morula, elementary body

Question 14

A distinctive feature of Rocky Mountain Spotted Fever (RMSF)rash is that is appears on the (limbs/face/palms)as well as the trunk.

Accepted Answer

The answer of A distinctive feature of Rocky Mountain Spotted...

Question 15

If the mother has (chlamydia/syphilis/yaws)at the time of birth,the pathogen can infect the newborn's eyes and may cause blindness.

Accepted Answer

The answer of If the mother has (chlamydia/syphilis/yaws)at the time...

Question 16

Which of the following statements concerning the causative agent of syphilis is TRUE?

Accepted Answer

A)   It is a large helically coiled bacterium motile by means of endoflagella.
B)   It is an intracellular parasite.
C)   It is a non-motile comma-shaped bacterium.
D)   It is a large bacillus with peritrichous flagella.
E)   It is pleomorphic and motile by means of gliding motility.

Question 17

Shortly after returning from a trip to several continents,a young man experiences episodes of fever,chills,muscle aches,and headache that recur at irregular intervals.The young man reports carrying only a large backpack and commonly staying in hostels along the way while traveling.Which of the following diseases is he likely to have?

Accepted Answer

A)   anaplasmosis
B)   scrub typhus
C)   louse-borne relapsing fever
D)   Lyme disease
E)   yaws

Question 18

The most important virulence factor of Vibrio cholerae is

Accepted Answer

A)   the presence of two axial flagella.
B)   the fact that it is oxidase positive.
C)   its ability to survive in fresh water.
D)   its ability to produce a potent exotoxin.
E)   its ability to live in estuarine and marine environments all over the world.

Question 19

Borrelia burgdorferi is an unusual bacterium that lacks iron-containing enzymes and proteins and causes (Brill-Zinser/Lyme/RMSF)disease in humans.

Accepted Answer

The answer of Borrelia burgdorferi is an unusual bacterium that...

Question 20

The normal habitat for Vibrio cholerae is (humans/animals/water).

Accepted Answer

The answer of The normal habitat for Vibrio cholerae is...

Exam 21: Rickettsias, Chlamydias, Spirochetes, and Vibrios