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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 C. trachomatis and C. pneumoniae antigens.

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

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

(E) Chamydiae frequently vary the epitopes of their antigens to avoid immune clearance.

As part of the control of C. psittaci and psittacosis in birds:

(A) All psittacine birds imported into the United States are first vaccinated.

(B) Psittacine birds hatched in the United States are preferred as pets.

(C) All birds are tested for C. psittaci infection.

(D) The shipment of all birds between states is highly regulated.

(E) Psittacine birds are fed penicillin G prophylactically.

Perinatal C. trachomatis infections frequently manifest as:

(A) urogenital disease.

(B) necrotic pneumonia.

(C) inclusion conjunctivitis.

(D) a pustular rash.

(E) endophthalmitis.

An adolescent girl came to the clinic because of a 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 C. trachomatis inside polymorphonuclear cells.

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

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

(E) Initial treatment is with ampicillin.

Which of following statements about trachoma is most accurate?

(A) It follows an acute eye infection with C. trachomatis.

(B) Millions of people in the United States have ...

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