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BACTE EE Flashcards

1
Q

A test for the hydrolysis of esculin in the
presence of bile is especially useful in
identifying species of the genus

A

C. Enterococcus

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2
Q

The organism associated with a disease
characterized by the presence of a
pseudomembrane in the throat and the
production of an exotoxin that is absorbed
into the bloodstream with a lethal effect is

A

D. Corynebacterium diphtheriae

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3
Q

Enterotoxin produced by Staphylococcus
aureus is responsible for causing

A

B. Enterocolitis

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4
Q

Abiotrophia, formerly known as nutritionally variant streptococci, will not grow on
routine blood or chocolate agars because
they are deficient in

A

B. Pyridoxal

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5
Q

Exfoliatin produced by Staphylococcus
aureus is responsible for causing

A

C. Scalded skin syndrome

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6
Q

Streptococcus pyogenes can be presumptively identified using a(an)

A

A. PYRdisk

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7
Q

A gram-positive coccus that is catalase
positive, nonmotile, lysostaphin resistant,
and modified oxidase positive is best
identified as a member of the genu

A

A. Micrococcus

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8
Q

Nocardia asteroides infections in humans
characteristically produce

A

B. Draining cutaneous sinuses

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9
Q

Erysipelothrix infections in humans
characteristically produce

A

A. Pathology at the point of entrance
of the organism

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10
Q

In the CAMP test, a single streak of a
beta-hemolytic Streptococcus is placed
perpendicular to a streak of beta-lysinproducing Staphylococcus aureus. After
incubation, a zone of increased lysis in the
shape of an arrowhead is noted; this
indicates the presumptive identification of

A

A. S. agalactiae

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11
Q

Staphylococcus saprophyticus, a recognized pathogen, is a cause of

A

D. Urinary tract infections

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12
Q

Color Plate 26 * shows the Gram stain of a
blood culture on a 23-year-old pregnant
woman who presented with fever and
flulike symptoms in her ninth month. The
isolate on blood agar produced small,
translucent beta-hemolytic colonies.
Which of the following is the most likely
etiologic agent in this case?

A

A. Listeria monocytogenes

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13
Q

The etiologic agent most commonly
associated with septicemia and meningitis
of newborns is

A

A. Streptococcus agalactiae

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14
Q

Which of the following is the most
commonly isolated species of Bacillus
in opportunistic infections such as
bacteremia, post-traumatic infections
of the eye, and endocarditis?

A

B. B. cereus

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15
Q

Loeffler’s serum medium is recommended
for the cultivation of

A

B. Corynebacterium diphtheriae

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16
Q

On Tinsdale agar, colonies of
Corynebacterium diphtheriae are
characterized by the observance of

A

C. Black colonies on the culture medium
surrounded by brown halos

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17
Q

Precipitates of diphtheria toxin and
antitoxin formed in agar gels are an in
vitro means for detecting toxigenic strains
of Corynebacterium diphtheriae. The
name of this test procedure is the

A

B. Elektest

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18
Q

The etiologic agent of the disease
erysipelas is

A

D. Streptococcus pyogenes

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19
Q

Staphylococcus aureus, when present,
could most likely be recovered from a
stool sample if the primary plating
medium included

A

B. Phenylethyl alcohol

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20
Q

A common member of the normal flora of
the upper respiratory tract is

A

D. Viridans streptococcus

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21
Q

Streptococci obtain all their energy from
the fermentation of sugars to

A

B. Lactic acid

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22
Q

Streptococci are unable to synthesize the
enzyme

A

A. Catalase

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23
Q

The beta-hemolysis produced by group A
Streptococcus seen on the surface of a
sheep blood agar plate is primarily the
result of streptolysin

A

B. M

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24
Q

When an infection due to Streptomyces is
suspected, isolates can be separated from
most other bacteria by

A

B. Incubating the culture at 25°C

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25
Q

The production of H2S is one characteristic used to differentiate which of the
aerobic gram-positive bacilli?

A

B. Erysipelothrix

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26
Q

Growth in a 48-hour semisolid agar stab
culture at room temperature reveals lateral
filamentous growth away from the stab
near the top of the medium. This observation is most characteristic of which
organism?

A

D. Listeria monocytogenes

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27
Q

A former species of Corynebacterium
pathogenic for swine, horses, and cattle is
also known to cause disease in compromised hosts. This organism when grown
on culture media produces pale pink
colonies that help to presumptively
identify it as

A

D. Rhodococcus equi

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28
Q

Which one of the following is not
appropriate when describing
Streptococcus pneumoniae ?

A

A. Bile-resistant

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29
Q

Nocardia can be differentiated from
Actinomyces based on

A

D. Nocardia being catalase positive

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30
Q

Enterococcus faecium is characteristically

A

B. Able to grow in the presence of high
concentrations of salt

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31
Q

A negative PYR (L-pyrolidonyl-a-naphthylamide) test is demonstrated by

A

D. Viridans streptococci

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32
Q

A Gram stain of a sputum specimen from
a patient with a suspected case of lobar
pneumonia reveals many white blood cells
and many gram-positive cocci, which are
primarily diplococci. Which of the
following statements would be appropriate, given these findings?

A

C. An optochin test should be performed
on the culture isolate.

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33
Q

A child presented in August at the
pediatric clinic with a superficial skin
infection of the neck. The large, itchy
lesions were cultured, and the diagnosis of
impetigo was made. One of the etiologic
agents of this clinical condition is

A

D. Streptococcus pyogenes

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34
Q

An identifying characteristic of
Staphylococcus aureus is

A

C. Mannitol fermentation postive

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35
Q

Which of the following organisms is able
to hydrolyze sodium hippurate to benzoic
acid and glycine?

A

A. Streptococcus agalactiae

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36
Q

Which of the following is not characteristic of Listeria monocytogenes ?

A

B. Catalase negative

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37
Q

Which of the following is not associated
with Staphylococcus aureus?

A

A. Endotoxin production

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38
Q

Which of the following is a characteristic
of staphylococci that would help in their
isolation from clinical specimens?

A

C. High salt tolerance

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39
Q

Which of the following species of Bacillus
is nonmotile?

A

C. B. anthracis

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40
Q

Which one of the following diseases
involves erythrogenic toxin?

A

A. Cutaneous anthrax

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41
Q

Cultures of the posterior pharynx are most
commonly submitted to the clinical
laboratory for the detection of

A

D. Streptococcus pyogenes

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42
Q

Streptococcus sanguis, a viridans
streptococcus, is most commonly
associated with which of the following
clinical conditions?

A

D. Subacute bacterial endocarditis

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43
Q

Rust-colored sputum in cases of lobar
pneumonia is characteristic of which of
the following possible etiologic agents?

A

C. Streptococcus pneumoniae

44
Q

A urine culture from a 23-year-old female
grew a catalase-positive gram-positive
coccus (> 100,000 cfu/mL), which would
most likely be

A

A. Staphylococcus saprophyticus

45
Q

Cystine-tellurite blood agar plates are
recommended for the isolation of

A

A. Corynebacterium diphtheriae

46
Q

The pulmonary form of anthrax is known as

A

D. Woolsorters disease

47
Q

Pleomorphic gram-positive bacilli in a
Gram stain best describes

A

D. Corynebacterium pseudodiphtheriticum

48
Q

An aerobic gram-positive rod known to
cause bacteremia in hospitalized imrnunocompromised patients is

A

B. Corynebacterium jeikeium

49
Q

A bone marrow transplant patient on
immunosuppressive therapy developed a
pulmonary abscess with symptoms of
neurologic involvement. A brain abscess
was detected by MRI, and aspirated
material grew an aerobic, filamentous,
branching gram-positive organism, which
stained weakly acid-fast. The most likely
etiologic agent in this case would be

A

B. Nocardia asteroides

50
Q

Which of the following is catalase
negative?

A

C. Leuconostoc

51
Q

Colonies of Listeria monocytogenes on a
sheep blood agar plate most closely
resemble colonies of

A

B. Streptococcus agalactiae

52
Q

The most common etiologic agent of
infections associated with the surgical
insertion of prosthetic devices such as
artificial heart valves and cerebrospinal
fluid shunts is

A

C. Staphylococcus epidermidis

53
Q

The description of “Medusa head”
colonies on solid agar is most characteristic of

A

A. Bacillus anthracis

54
Q

Which of the following is most likely to be
isolated in cultures from the anterior nares
of healthcare workers?

A

C. Staphylococcus aureus

55
Q

Ethylhydrocupreine HC1 susceptibility is a
presumptive test for the identification of

A

D. Streptococcus pneumonias

56
Q

Solubility in the presence of sodium
desoxycholate is characteristic of

A

D. Streptococcus pneumoniae

57
Q

Family members attending a picnic
became ill about 2 hours after eating. The
illness was characterized by rapid onset of
violent vomiting. The most likely bacterial
cause of such symptoms would be food
poisoning caused by

A

D. Staphylococcus aureus

58
Q

The novobiocin susceptibility test is used
for the identification of

A

D. Staphylococcus saprophyticus

59
Q

Tellurite reduction is used for the
presumptive identification of

A

B. Corynebacterium diphtheriae

60
Q

The etiologic agent of the majority of
adult joint infections is

A

C. Staphylococcus aureus

61
Q

Which of the following is associated with
infections in humans often linked to deli
meats and improperly pasteurized dairy
products?

A

B. Listeria monocytogenes

62
Q

Bacillus cereus has been implicated as the
etiologic agent in cases of

A

A. Food poisoning

63
Q

The causative agent of “malignant
pustule” is

A

A. Bacillus anthracis

64
Q

An infant was hospitalized with a severe,
tender erythema. The child’s epidermis
was loose, and large areas of skin could
be peeled off. The condition described is
most consistent with a clinical syndrome
associated with

A

B. Staphylococcus aureus

65
Q

A catalase-negative gram-positive coccus
is isolated from a urine sample of a
hospitalized patient. The bacterium
produced a black pigment on bile-esculin
agar and formed acid from glucose in the
presence of 6.5% NaCl. What is the most
likely identification of this bacterium?

A

B. Enterococcus faecalis

66
Q

In suspected cases of brucellosis, the
optimal specimen to be collected for the
isolation of the etiologic agent is

A

A. Blood

67
Q

The majority of clinical isolates of
Klebsiella are

A

B. K. pneumoniae

68
Q

The enterotoxins of both Vibrio cholerae
Ol and noninvasive (toxigenic) strains of
Escherichia coli produce serious diarrhea
by what mechanism?

A

A. Stimulation of adenylate cyclase,
which gives rise to excessive fluid
secretion by the cells of the small
intestine

69
Q

Colonies ofNeisseria sp. turn color when
a redox reagent is applied. The color
change is indicative of the activity of the
bacterial enzyme

A

C. Cytochrome oxidase

70
Q

Which of the following is not true of
Shigella sonnei?

A

A. Large numbers of organisms must be
ingested to produce disease.

71
Q

An environmental sampling study of
respiratory therapy equipment produced
cultures of a yellow, nonfermentative (at
48 hours), gram-negative bacillus from
several of the nebulizers, which would
most likely be species of

A

A. Chryseobacterium

72
Q

The characteristics of being lactose
negative, citrate negative, urease negative,
lysine decarboxylase negative, and
nonmotile best describe which organism?

A

D. Shigella dysenteriae

73
Q

A fermentative gram-negative bacillus that
is oxidase positive, motile, and grows well
on MacConkey agar is

A

A. Aeromonas hydrophila

74
Q

Fecal cultures are inoculated on
thiosulfate-citrate-bile salts-sucrose
agar specifically for the isolation of

A

B. Vibrio

75
Q

The K antigen of the family
Enterobacteriaceae is

A

A. Heat labile

76
Q

The causative agent of melioidosis is

A

B. Burkholderia pseudomallei

77
Q

Which microorganism will grow only on
culture media supplemented with either
cysteine or cystine?

A

C. Francisella tularensis

78
Q

A culture of a decubitus ulcer grew a
gram-negative facultative bacillus. On TSI
it produced an acid slant, acid butt, and
gas. Test reactions in other media were as
follows:
Citrate = neg
Indole = pos
Urease = neg
ONPG = pos
Voges-Proskauer = neg

A

B. Escherichia coli

79
Q

An example of an oxidase-positive,
glucose nonfermenting organism is

A

D. Pseudomonas aeruginosa

80
Q

A fastidious gram-negative bacillus was
isolated from a case of periodontal
disease, which upon darkfield examination
was noted to have gliding motility. The
most likely identification of this etiologic
agent would be

A

A. Capnocytophaga

81
Q

The species of Vibrio closely associated
with rapidly progressing wound infections
seen in patients with underlying liver
disease is

A

C. V. vulnificus

82
Q

Severe disseminated intravascular
coagulation often complicates cases of
septicemia caused by

A

D. Neisseria meningitidis

83
Q

The Haemophilus influenzas vaccine
protects against which serotype?

A

B. Serotype b

84
Q

Salmonella Typhi exhibits a characteristic
biochemical pattern, which differentiates
it from the other salmonellae. Which
of the following is not characteristic of
S. Typhi?

A

A. Large amounts of H2S are produced in
TSI agar.

85
Q

The sexually acquired disease characterized by genital ulcers and tender inguinal
lymphadenopathy, which is caused by a
small, gram-negative bacillus, is known as

A

A. Chancroid

86
Q

Which of the following diseases is most
likely to be acquired from a hot tub or
whirlpool?

A

D. Pseudomonas dermatitis

87
Q

Campylobacter spp. are associated most
frequently with cases of

A

B. Gastroenteritis

88
Q

An organism occasionally misidentified as
an enteric pathogen because it produces a
large amount of H2S is

A

D. Shewanella putrefaciens

89
Q

The etiologic agent of whooping cough is

A

A. Bordetella pertussis

90
Q

An important characteristic of Neisseria
gonorrhoeae or the infection it produces is

A

B. Asymptomatic infections are common
in females.

91
Q

Which of the following organisms would
most likely produce the biochemical
reactions shown in Color Plate 27 *?

A

D. Salmonella

92
Q

A gram-negative, “kidney bean” cellular
morphology is a distinguishing characteristic of

A

A. Neisseria meningitidis

93
Q

Which of the following nonfermenters is
rarely isolated in the U.S.?

A

C. Burkholderia mallei

94
Q

Erythromycin eye drops are routinely
administered to infants to prevent
infections by

A

D. Neisseria gonorrhoeae

95
Q

Neisseria lactamica closely resembles
Neisseria meningitidis but can be
differentiated from it by its ability to
metabolize

A

B. Lactose

96
Q

A causative agent of the form of conjunctivitis known as pinkeye is

A

A. Haemophilus aegyptius

96
Q

The single species in the genus Hafiiia is

A

A. alvei

97
Q

Acinetobacter baumannii

A

B. Is oxidase negative

98
Q

Legionella pneumophila is the etiologic
agent of both Legionnaires disease and

A

B. Pontiac fever

99
Q

In suspected cases of brucellosis, what is
the most sensitive specimen to submit for
culture?

A

A. Bone marrow

100
Q

Hemolytic uremic syndrome is a complication after infection with

A

A. E. coli O157:H7

101
Q

Identify the fermentative agent that may
infect reptiles and fish as well as humans
when they are exposed to contaminated
soil or water.

A

A. Aeromonas

102
Q

Campylobacterjejuniis

A

C. Hippurate hydrolysis positive

103
Q

Which of the following has a negative
oxidase test?

A

C. Hafnia

104
Q

Which of the following is true of
Neisseria gonorrhoeae ?

A

A. Adversly affected by fatty acids in
clinical specimens

105
Q
A
105
Q

The symptom of diffuse, watery diarrhea
that produces a relatively clear stool
containing mucus flecks is suggestive of
an infection caused by

A

MTAP EE (3 decks)

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