The most common etiologic agent of community-acquired pneumonia in adults older than 30 years of age is ___ pneumoniae.
a. Mycoplasma
b. Chlamydophila
c. Streptococcus
d. Klebsiella
When performing quality control on motility media, which of the following organisms should be used?
a. Acidovorax facilis and Sphingomonas spp.
b. Centers for Disease Control and Preven-tion (CDC) group IIc and CDC group IIe
c. CDC group Iii and Sphingobacterium mi-zutaii
d. CDC group IIh and A. facilis
Which of the following toxins contributes to the virulence of B. pertussis and works by hemolyzing red cells and activating cyclic adenosine monophosphate, which inactivates several types of host immune cells?
a. Endotoxin
b. Pertussis toxin
c. Tracheal cytotoxin
d. Adenylate cyclase toxin
M. pneumoniae is detected as the most common agent of lower respiratory tract infection among:
a. previously healthy patients 2 months to 5 years of age.
b. adults younger than 30 years of age.
c. community-acquired pneumonia in adults.
d. school-age children.
One of the most common causes of bacterial pneumonia in school-age children (5 to 14 years of age) is:
a. H. influenzae type B.
b. Corynebacterium diphtheriae.
c. Streptococcus pyogenes.
d. M. pneumoniae.
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