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Chapter 27: Chlamydia spp.
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Which of the following statements about chlamydial antigens is correct?
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(A) Chlamydiae have shared group or genus-specific antigens.
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(B) There is no cross-reaction between Chlamydia trachomatis and Chlamydia pneumoniae antigens.
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(C) All five serovars of Chlamydia pneumoniae cross-react with Chlamydia psittaci.
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(D) One serovar of Chlamydia trachomatis causes eye infections, and the second serovar causes genital infections.
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The following are part of the control of Chlamydia psittaci and psittacosis in birds except
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(A) Quarantine of psittacine birds imported into the United States
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(B) Only allowing sale of psittacine birds hatched in the United States
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(C) Testing of birds for C psittaci infection
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(D) Controlling the shipment of psittacine birds
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(E) Putting tetracycline in the feed of psittacine birds
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All of the following statements about perinatal Chlamydia trachomatis infections are correct except
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(A) Between 15% and 40% of infants born to infected women develop inclusion conjunctivitis.
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(B) Between 10% and 20% of infants born to infected women develop infant pneumonia.
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(C) The incubation period for Chlamydia trachomatis inclusion conjunctivitis is 1–2 days.
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(D) The incubation period for infant pneumonia is typically 2–12 weeks.
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(E) Ocular prophylaxis with erythromycin or tetracycline for neonatal Neisseria gonorrhoeae infection is generally not effective against neonatal Chlamydia trachomatis infection.
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(F) Infant pneumonia caused by Chlamydia trachomatis often presents with a staccato cough.
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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?
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(A) A serologic test for syphilis is not indicated because her symptoms are not those of syphilis.
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(B) A Gram stain of her endocervical specimen would show Chlamydia trachomatis inside polymorphonuclear cells.
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(C) The differential diagnosis includes infection with Neisseria gonorrhoeae, Chlamydia trachomatis, or both.
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(D) The endocervical specimen should be analyzed for herpes simplex.
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