Each of the following statements concerning epidemic typhus is correct EXCEPT
A. The disease is charcterized by a rash
B. The Wail Felix test can aid in diagnosis of the disease
C. The disease is caused by a rickettsia
D. The causative organism is transmitted from rodents to humans by a tick
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Which one of the following bacteria containing the cross antigen of some rickettsiae
A. Proteus
B. E.coli
C. S.typhi
D. Shigella
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
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