BACTE EE Flashcards by Pauline Alcaraz

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

C. Enterococcus

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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

D. Corynebacterium diphtheriae

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Enterotoxin produced by Staphylococcus
aureus is responsible for causing

B. Enterocolitis

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

B. Pyridoxal

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Exfoliatin produced by Staphylococcus
aureus is responsible for causing

C. Scalded skin syndrome

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Streptococcus pyogenes can be presumptively identified using a(an)

A. PYRdisk

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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. Micrococcus

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Nocardia asteroides infections in humans
characteristically produce

B. Draining cutaneous sinuses

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Erysipelothrix infections in humans
characteristically produce

A. Pathology at the point of entrance
of the organism

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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. S. agalactiae

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Staphylococcus saprophyticus, a recognized pathogen, is a cause of

D. Urinary tract infections

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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. Listeria monocytogenes

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

A. Streptococcus agalactiae

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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?

B. B. cereus

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Loeffler’s serum medium is recommended
for the cultivation of

B. Corynebacterium diphtheriae

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

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

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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

B. Elektest

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The etiologic agent of the disease
erysipelas is

D. Streptococcus pyogenes

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

B. Phenylethyl alcohol

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

D. Viridans streptococcus

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Streptococci obtain all their energy from
the fermentation of sugars to

B. Lactic acid

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Streptococci are unable to synthesize the
enzyme

A. Catalase

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

B. M

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

B. Incubating the culture at 25°C

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

B. Erysipelothrix

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?

D. Listeria monocytogenes

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

D. Rhodococcus equi

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

A. Bile-resistant

Nocardia can be differentiated from Actinomyces based on

D. Nocardia being catalase positive

Enterococcus faecium is characteristically

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

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

D. Viridans streptococci

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?

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

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

D. Streptococcus pyogenes

An identifying characteristic of Staphylococcus aureus is

C. Mannitol fermentation postive

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

A. Streptococcus agalactiae

Which of the following is not characteristic of Listeria monocytogenes ?

B. Catalase negative

Which of the following is not associated with Staphylococcus aureus?

A. Endotoxin production

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

C. High salt tolerance

Which of the following species of Bacillus is nonmotile?

C. B. anthracis

Which one of the following diseases involves erythrogenic toxin?

A. Cutaneous anthrax

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

D. Streptococcus pyogenes

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

D. Subacute bacterial endocarditis

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

C. Streptococcus pneumoniae

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. Staphylococcus saprophyticus

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

A. Corynebacterium diphtheriae

The pulmonary form of anthrax is known as

D. Woolsorters disease

Pleomorphic gram-positive bacilli in a Gram stain best describes

D. Corynebacterium pseudodiphtheriticum

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

B. Corynebacterium jeikeium

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

B. Nocardia asteroides

Which of the following is catalase negative?

C. Leuconostoc

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

B. Streptococcus agalactiae

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

C. Staphylococcus epidermidis

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

A. Bacillus anthracis

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

C. Staphylococcus aureus

Ethylhydrocupreine HC1 susceptibility is a presumptive test for the identification of

D. Streptococcus pneumonias

Solubility in the presence of sodium desoxycholate is characteristic of

D. Streptococcus pneumoniae

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

D. Staphylococcus aureus

The novobiocin susceptibility test is used for the identification of

D. Staphylococcus saprophyticus

Tellurite reduction is used for the presumptive identification of

B. Corynebacterium diphtheriae

The etiologic agent of the majority of adult joint infections is

C. Staphylococcus aureus

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

B. Listeria monocytogenes

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

A. Food poisoning

The causative agent of "malignant pustule" is

A. Bacillus anthracis

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

B. Staphylococcus aureus

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?

B. Enterococcus faecalis

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

A. Blood

The majority of clinical isolates of Klebsiella are

B. K. pneumoniae

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

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

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

C. Cytochrome oxidase

Which of the following is not true of Shigella sonnei?

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

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. Chryseobacterium

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

D. Shigella dysenteriae

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

A. Aeromonas hydrophila

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

B. Vibrio

The K antigen of the family Enterobacteriaceae is

A. Heat labile

The causative agent of melioidosis is

B. Burkholderia pseudomallei

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

C. Francisella tularensis

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

B. Escherichia coli

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

D. Pseudomonas aeruginosa

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. Capnocytophaga

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

C. V. vulnificus

Severe disseminated intravascular coagulation often complicates cases of septicemia caused by

D. Neisseria meningitidis

The Haemophilus influenzas vaccine protects against which serotype?

B. Serotype b

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. Large amounts of H2S are produced in TSI agar.

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. Chancroid

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

D. Pseudomonas dermatitis

Campylobacter spp. are associated most frequently with cases of

B. Gastroenteritis

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

D. Shewanella putrefaciens

The etiologic agent of whooping cough is

A. Bordetella pertussis

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

B. Asymptomatic infections are common in females.

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

D. Salmonella

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

A. Neisseria meningitidis

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

C. Burkholderia mallei

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

D. Neisseria gonorrhoeae

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

B. Lactose

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

A. Haemophilus aegyptius

The single species in the genus Hafiiia is

A. alvei

Acinetobacter baumannii

B. Is oxidase negative

Legionella pneumophila is the etiologic agent of both Legionnaires disease and

B. Pontiac fever

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

A. Bone marrow

Hemolytic uremic syndrome is a complication after infection with

A. E. coli O157:H7

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

A. Aeromonas

Campylobacterjejuniis

C. Hippurate hydrolysis positive

Which of the following has a negative oxidase test?

C. Hafnia

Which of the following is true of Neisseria gonorrhoeae ?

A. Adversly affected by fatty acids in clinical specimens

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

BACTE EE Flashcards

(107 cards)