Clinical Microbiology Final Exam Questions With Complete
Solutions
_________________ swabs are preferred to recover
parainfluenza, RSV, and influenza viruses while
_______________ swabs are preferred to recover adenoviruses
and HSV. Correct Answers Nasopharyngeal, throat
__________________ is a fourfold antibody titer rise detected
in ______________ sera that indicates _______________
disease. Correct Answers Seroconversion, convalescent,
current or recent
(A) True or (B) False: Reporting or formal documentation of an
accident in the lab must be done FIRST before the healthcare
worker receives immediate medical care. Correct Answers
False
A 13-year-old girl presented to her physician complaining of
being tired, having a mild sore throat and fever. She appears to
have a grey coating on her tonsils when examined by the
physician. The most logical etiologic agent associated with the
patient's illness is: Correct Answers diphtheriae.
A 25-year old man was admitted to the hospital for malaise and
shortness of breath of one day's duration. Three days before
admission, he had developed sneezing, runny nose, headache
behind his eyes, a feer, and red blotches on his face. The rash
covered most of his face and had spread to his arms and trunk,
white spots on buccal mucosa.
,What disease is suggested by rash, fever,, spots in pts mucosa.
Correct Answers Measles
A 25-year-old woman complained of fever, flank pain, dysuria,
urgency to urinate, and blood-tinged urine. What is the causative
agent?
Lab Findings:
A urinalysis revealed many white blood cells and white blood
cell casts, leukocyte esterase test was positive
A urine culture grew 50,000 CFU/ml
The organism:
white, nonhemolytic, colonies on blood agar
no growth appeared on MacConkey's agar
catalase-positive and
slide-and-tube-coagulase negative
It produced no zone of inhibition in the presence of a novobiocin
disc Correct Answers S.saprophyticus
A 4-year-old boy who is in day care 3 days per week is irritable
and scratching the area around his anus. What morphologic
characteristics would most likely be observed on microscopic
examination of the appropriate specimen? Correct Answers
Football-shaped eggs with one flattened side
A 6-year-old boy was diagnosed with purulent conjunctivitis
caused by a species of Haemophilus. What would the
biochemical profile of the organism be? Correct Answers
Growth requirements require both X and V factors; the organism
is hemolytic on rabbit blood.
,A 7-year-old girl was at summer camp and dove into the lake
many times. She complained that water went up her nose a few
times. Several days later she is unresponsive and comatose and
rushed to the hospital. A cerebrospinal fluid (CSF) specimen is
drawn, and several motile amebae are observed. She is most
likely suffering from an infection with which of the following
parasites? Correct Answers Naegleria fowleri
A bacterial colony can be described as: Correct Answers
sufficiently large numbers of a bacterium that can be observable
with the unaided eye.
A bronchoscopy was performed on a patient who later
developed a nosocomial infection as a result of the procedure.
The organism recovered from his lung was a nonlactose
fermenter that oxidized glucose and maltose, was lysine
decarboxylase-positive, and was motile. The organism is most
likely which one of the following? Correct Answers S.
maltophilia
A candle jar is used to cultivate which type of bacteria? Correct
Answers Capnophiles
A catalase test was performed from a sheep blood agar plate on
a colony of streptococci, and bubbling was observed. Which of
the following statements explains this discrepancy? Correct
Answers The colony may have been contaminated with sheep
red blood cells, causing a false-positive result.
, A catalase-negative, non-spore forming, and gram-positive rod
that is not acid-fast could possibly belong to which group of
bacteria? Correct Answers Erysipelothrix
A catalase-negative, non-spore forming, nonbranching, gram-
positive rod that produces hydrogen sulfide when inoculated into
triple sugar iron (TSI) agar is most likely: Correct Answers
Erysipelothrix.
A catalase-positive, gram-positive bacillus that is not acid-fast,
does not branch, and does not form spores could possibly belong
to which group of bacteria? Correct Answers Corynebacterium
A catheter urine culture grew 78 cols from a 0.01 (not.001) loop.
The organism had the following
characteristics: How should these findings be reported?
BA: swarming
Mac: non-lactose fermenter
Indole: positive
Ampicillin: susceptible Correct Answers 7,800 CFU/ml of
P.vulgaris
A catheter urine culture grew 78 cols from a 0.01 (not.001) loop.
The organism had the following characteristics: How should
these findings be reported?
BA: swarming
Mac: non-lactose fermenterIndole: positiveAmpicillin:
susceptible Correct Answers 7,800 CFU/ml of P.vulgaris
Solutions
_________________ swabs are preferred to recover
parainfluenza, RSV, and influenza viruses while
_______________ swabs are preferred to recover adenoviruses
and HSV. Correct Answers Nasopharyngeal, throat
__________________ is a fourfold antibody titer rise detected
in ______________ sera that indicates _______________
disease. Correct Answers Seroconversion, convalescent,
current or recent
(A) True or (B) False: Reporting or formal documentation of an
accident in the lab must be done FIRST before the healthcare
worker receives immediate medical care. Correct Answers
False
A 13-year-old girl presented to her physician complaining of
being tired, having a mild sore throat and fever. She appears to
have a grey coating on her tonsils when examined by the
physician. The most logical etiologic agent associated with the
patient's illness is: Correct Answers diphtheriae.
A 25-year old man was admitted to the hospital for malaise and
shortness of breath of one day's duration. Three days before
admission, he had developed sneezing, runny nose, headache
behind his eyes, a feer, and red blotches on his face. The rash
covered most of his face and had spread to his arms and trunk,
white spots on buccal mucosa.
,What disease is suggested by rash, fever,, spots in pts mucosa.
Correct Answers Measles
A 25-year-old woman complained of fever, flank pain, dysuria,
urgency to urinate, and blood-tinged urine. What is the causative
agent?
Lab Findings:
A urinalysis revealed many white blood cells and white blood
cell casts, leukocyte esterase test was positive
A urine culture grew 50,000 CFU/ml
The organism:
white, nonhemolytic, colonies on blood agar
no growth appeared on MacConkey's agar
catalase-positive and
slide-and-tube-coagulase negative
It produced no zone of inhibition in the presence of a novobiocin
disc Correct Answers S.saprophyticus
A 4-year-old boy who is in day care 3 days per week is irritable
and scratching the area around his anus. What morphologic
characteristics would most likely be observed on microscopic
examination of the appropriate specimen? Correct Answers
Football-shaped eggs with one flattened side
A 6-year-old boy was diagnosed with purulent conjunctivitis
caused by a species of Haemophilus. What would the
biochemical profile of the organism be? Correct Answers
Growth requirements require both X and V factors; the organism
is hemolytic on rabbit blood.
,A 7-year-old girl was at summer camp and dove into the lake
many times. She complained that water went up her nose a few
times. Several days later she is unresponsive and comatose and
rushed to the hospital. A cerebrospinal fluid (CSF) specimen is
drawn, and several motile amebae are observed. She is most
likely suffering from an infection with which of the following
parasites? Correct Answers Naegleria fowleri
A bacterial colony can be described as: Correct Answers
sufficiently large numbers of a bacterium that can be observable
with the unaided eye.
A bronchoscopy was performed on a patient who later
developed a nosocomial infection as a result of the procedure.
The organism recovered from his lung was a nonlactose
fermenter that oxidized glucose and maltose, was lysine
decarboxylase-positive, and was motile. The organism is most
likely which one of the following? Correct Answers S.
maltophilia
A candle jar is used to cultivate which type of bacteria? Correct
Answers Capnophiles
A catalase test was performed from a sheep blood agar plate on
a colony of streptococci, and bubbling was observed. Which of
the following statements explains this discrepancy? Correct
Answers The colony may have been contaminated with sheep
red blood cells, causing a false-positive result.
, A catalase-negative, non-spore forming, and gram-positive rod
that is not acid-fast could possibly belong to which group of
bacteria? Correct Answers Erysipelothrix
A catalase-negative, non-spore forming, nonbranching, gram-
positive rod that produces hydrogen sulfide when inoculated into
triple sugar iron (TSI) agar is most likely: Correct Answers
Erysipelothrix.
A catalase-positive, gram-positive bacillus that is not acid-fast,
does not branch, and does not form spores could possibly belong
to which group of bacteria? Correct Answers Corynebacterium
A catheter urine culture grew 78 cols from a 0.01 (not.001) loop.
The organism had the following
characteristics: How should these findings be reported?
BA: swarming
Mac: non-lactose fermenter
Indole: positive
Ampicillin: susceptible Correct Answers 7,800 CFU/ml of
P.vulgaris
A catheter urine culture grew 78 cols from a 0.01 (not.001) loop.
The organism had the following characteristics: How should
these findings be reported?
BA: swarming
Mac: non-lactose fermenterIndole: positiveAmpicillin:
susceptible Correct Answers 7,800 CFU/ml of P.vulgaris
