The vector of Rickettsia prowazekii is
A. human louse
B. flea
C. mosquito
D. tick
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Rickettsiae, which include the spotted fevers, typhus, and scrub typhus, are
A. Obligate intracellular parasites
B. Stable outside the host cell
C. Easily stained (Gram-negative) with a Gram stain
D. Maintained in nature with humans as the mammalian reservoir
Chlamydiae have an unusual three-stage cycle of development. The correct sequence of these events is
A. Penetration of the host cell, synthesis of elementary body progeny, development of an initial body
B. Penetration of the host cell, development of an initial body, synthesis of elementary body progeny
C. Development of an initial body, synthesis of elementary body progeny, penetration of the host cell
D. Synthesis of elementary body progeny, development of an initial body, penetration of the host cell
E. Synthesis of elementary body progeny, penetration of the host cell, development of an initial body
Chlamydiae trachomatis is a well-known cause of venereal disease. This organism is also implicated in which of the following?
A. Classic trachoma infection
B. Sexually transmitted cardiac disease in adults
C. Perinatal retinitis
D. Middle-ear infection in young children
E. Urinary tract infection in children
Each of the following statements concerning Chlamydia trachomatis is correct EXCEPT
A. It is an important cause of nongonococcal urethritis
B. It is an important cause of conjunctivitis
C. It is the cause of lymphograauloma venereum
D. it is an important cause of subacute bacteriai endocarditis
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