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Chapter 27: Chlamydia spp.

Which of the following statements about chlamydial antigens is correct?

(A) Chlamydiae have shared group or genus-specific antigens.

(B) There is no cross-reaction between Chlamydia trachomatis and Chlamydia pneumoniae antigens.

(C) All five serovars of Chlamydia pneumoniae cross-react with Chlamydia psittaci.

(D) One serovar of Chlamydia trachomatis causes eye infections, and the second serovar causes genital infections.

The following are part of the control of Chlamydia psittaci and psittacosis in birds except

(A) Quarantine of psittacine birds imported into the United States

(B) Only allowing sale of psittacine birds hatched in the United States

(C) Testing of birds for C psittaci infection

(D) Controlling the shipment of psittacine birds

(E) Putting tetracycline in the feed of psittacine birds

All of the following statements about perinatal Chlamydia trachomatis infections are correct except

(A) Between 15% and 40% of infants born to infected women develop inclusion conjunctivitis.

(B) Between 10% and 20% of infants born to infected women develop infant pneumonia.

(C) The incubation period for Chlamydia trachomatis inclusion conjunctivitis is 1–2 days.

(D) The incubation period for infant pneumonia is typically 2–12 weeks.

(E) Ocular prophylaxis with erythromycin or tetracycline for neonatal Neisseria gonorrhoeae infection is generally not effective against neonatal Chlamydia trachomatis infection.

(F) Infant pneumonia caused by Chlamydia trachomatis often presents with a staccato cough.

An adolescent girl came to the clinic because of a new and unusual vaginal discharge. She had recently become sexually active and had two new partners during the previous month. On pelvic examination, a purulent discharge was seen at the opening of her endocervical canal. Which of the following statements about this patient is most correct?

(A) A serologic test for syphilis is not indicated because her symptoms are not those of syphilis.

(B) A Gram stain of her endocervical specimen would show Chlamydia trachomatis inside polymorphonuclear cells.

(C) The differential diagnosis includes infection with Neisseria gonorrhoeae, Chlamydia trachomatis, or both.

(D) The endocervical specimen should be analyzed for herpes simplex.


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