Which one of the following bacteria containing the cross antigen of some rickettsiae
A. Proteus
B. E.coli
C. S.typhi
D. Shigella
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The vector of Rickettsia prowazekii is
A. human louse
B. flea
C. mosquito
D. tick
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
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