Deck 24: Chlamydia and Rickettsia

Question 1

What disease does Chlamydia psittaci cause in humans?

A) Conjunctivitis
B) Endocarditis
C) Parrot fever
D) Bird flu

Answer 1

C
C.psittaci is the cause of psittacosis,also known as ornithosis or Parrot fever.

Question 2

What organism causes endemic typhus?

A) Rickettsia typhi
B) R. canada
C) R. rickettsii
D) R. prowazekii

Answer 2

A
Endemic typhus is caused by R.typhi.The arthropod vector is the oriental rat flea and the rat is the reservoir.

Question 3

What has an outer membrane similar to that of many gram-negative bacteria,with the most prominent feature being the major outer membrane protein?

A) Haemophilus
B) Reticulate body
C) Elementary body (EB)
D) Intracellular parasites

Answer 3

C
The EB has an outer membrane similar to that of many gram-negative bacteria.The most prominent component of this membrane is the major outer membrane protein.

Question 4

Why are antibody detection methods for Chlamydia trachomatis infection severely limited in the knowledge they provide the physician?

A) Because C. trachomatis is an intracellular parasite, the body does not produce antibodies against it.
B) Only IgE antibodies are produced against C. trachomatis.
C) Many people have antibodies from previous infections, and local infections do not cause great increases in antibody levels.
D) All of the above.

Question 5

What testing method is the method of choice for detecting antibodies to Chlamydia pneumoniae?

A) Direct fluorescent antibody (DFA)
B) Serologic tests
C) Cell culture
D) Enzyme immunoassay (EIA)

Question 6

What organism has been established as a risk factor for Guillain-Barré syndrome?

A) Chlamydia pneumoniae
B) C. trachomatis
C) C. psittaci
D) C. urealyticum

Question 7

Infants can contract all the following chlamydial infections when passing through the birth canal EXCEPT:

A) Conjunctivitis
B) Nasopharyngeal infections
C) Pneumonia
D) Endocarditis

Question 8

What disease,caused by Chlamydia trachomatis,is considered a sexually transmitted disease where the organisms enter the lymph nodes near the genital tract,resulting in bubo formation and ultimately rupturing the lymph node?

A) Lymphogranuloma venereum (LGV)
B) Trachoma
C) Pelvic inflammatory disease (PID)
D) Conjunctivitis

Question 9

What method is used to confirm a positive Chlamydia trachomatis enzyme immunoassay (EIA)?

A) Cytologic methods
B) Direct fluorescent antibody (DFA)
C) Cell culture
D) Nucleic acid probes

Question 10

What organism causes epidemic louse-borne typhus?

A) Rickettsia typhi
B) R. canada
C) R. rickettsii
D) R. prowazekii

Question 11

What organisms are considered obligate intracellular parasites?

A) Chlamydia
B) Mycoplasma
C) Ureaplasma
D) Haemophilus

Question 12

What organism causes Rocky Mountain spotted fever?

A) Rickettsia prowazekii
B) R. typhi
C) R. canada
D) R. rickettsii

Question 13

What is the most commonly used test technique to detect Chlamydia trachomatis infection?

A) Enzyme immunoassay (EIA)
B) Nucleic acid probes
C) Cell culture
D) Cytologic methods

Question 14

Chlamydia trachomatis is the infectious agent in all the following conditions in humans EXCEPT:

A) Trachoma
B) Urogenital infections
C) Lymphogranuloma venereum (LGV)
D) Pharyngitis

Question 15

What organism's unique life cycle contains an elementary body and a reticulate body?

A) Haemophilus
B) Chlamydia
C) Ureaplasma
D) Mycoplasma

Question 16

Guidelines for reporting the results of Chlamydia trachomatis testing on patients include all the following EXCEPT:

A) Testing specifically using profiles
B) Reporting which tests were and were not performed
C) Reporting unusual observations
D) Performing a routine culture in addition to all the tests for Chlamydia

Question 17

All of the following are urogenital infections in men,produced by Chlamydia trachomatis,EXCEPT:

A) Epididymitis
B) Orchitis
C) Prostatitis
D) Nongonococcal urethritis (NGU)

Question 18

A young man goes to his doctor complaining of a discharge from his penis.The doctor collects a slide for Gram stain and a swab for culture and sends them to the laboratory.The Gram stain is prepared and read: > 25 wbc/hpf,no bacteria seen.The culture results after 48 hours show no growth.What is the most probable diagnosis and the organism responsible?

A) Urethritis, Streptococcus pneumonia
B) Epididymitis, Moraxella
C) Nongonococcal urethritis, Neisseria meningitidis
D) Nongonococcal urethritis, Chlamydia trachomatis

Question 19

How is infection by Chlamydia psittaci determined in humans?

A) Direct fluorescent antibody (DFA)
B) Cell culture
C) Enzyme immunoassay (EIA)
D) Serologic methods

Question 20

Chlamydia trachomatis produces all the following conditions in adult women EXCEPT:

A) Pelvic inflammatory disease (PID)
B) Salpingitis
C) Bacterial vaginosis
D) Endometritis

Question 21

What organism causes the human ehrlichiosis that occurs mostly in Japan and a fish trematode is the vector?

A) Neorickettsia sennetsu
B) Ehrlichia chaffeensis
C) Anaplasma phagocytophilum
D) Leptotrombidium deliensis