#3) Questions and Complete Solutions
Graded A+
Which of the following is an accurate statement regarding the antibiogram for Staphylococcus isolates
shown below?
Total # of Isolates Clindamycin Tetracycline Trimeth/Sulfa Vancomycin Staphylococcus aureus 200 78 92
86 100 MRSA 147 69 93 88 100 Staphylococcus, coagulase-negative 98 100
1) 50 percent of Staphylococcus aureus isolates were resistant to Vancomycin
2) 12 percent of MRSA isolates were resistant to Trimeth/Sulfa
3) Clindamycin should not be used for coagulase-negative Staphylococcus infections in this facility
because 100 percent of isolates were resistant to it 4) There were no cases of Vancomycin-resistant
Staphylococcus aureus in this facility
a. 2
b. 2, 4
c. 1, 2, 4
d. 1, 2, 3, 4 - Answer: b. 2, 4
The most unlikely method of transmission of infection in a healthcare setting would be:
a. Airborne
b. Vehicle
c. Vector
d. Contact - Answer: c. Vector
After an incident in which human milk from one mother was mistakenly fed to another mother's infant,
the infection preventionist (IP) is tasked with leading a team to determine why the event occurred and
how it can be prevented from happening again in the future. This type of analysis is known as:
a. Root cause analysis (RCA)
b. Gap analysis
c. Strengths-weaknesses-opportunities-threats (SWOT) analysis
,d. Failure mode effect analysis (FMEA) - Answer: a. Root cause analysis (RCA)
Which one of the following best describes the difference between a common point source outbreak and
a propagated outbreak?
a. Case fatality rates in common source outbreaks are higher
b. Person-to-person transmission is a feature of common source outbreaks
c. The attack rate in propagated outbreaks is higher
d. All cases in a common point source outbreak occur within one incubation period of the exposure -
Answer: d. All cases in a common point source outbreak occur within one incubation period of the
exposure
Which of the following aid in the diagnosis of pseudomembranous colitis (PMC)?
1) Colonoscopic biopsy of lesions
2) Raised antibody levels in blood to Clostridium difficile toxin
3) Positive blood culture for Clostridium difficile
4) Stool assays for Clostridium difficile
a. 1, 2
b. 2, 3
c. 3, 4
d. 1, 4 - Answer: d. 1, 4
A patient is admitted with fever, nausea and vomiting, sensitivity to light, and stiff neck. Symptom onset
has been progressing slowly over several weeks. The Gram stain of the cerebrospinal fluid (CSF) is India
ink positive, and there is low glucose and predominant lymphocytes. What type of precautions is
required for this patient?
a. Standard plus Droplet Precautions
b. Standard Precautions
c. Standard plus Airborne Precautions
d. Standard plus Contact Precautions - Answer: b. Standard Precautions
,How can streptococci be differentiated from staphylococci under the microscope following the Gram
stain procedure?
a. Staphylococci are Gram positive cocci, while streptococci are Gram positive bacilli
b. Staphylococci are Gram negative bacilli, while streptococci are Gram negative cocci
c. Staphylococci are Gram positive, while streptococci are Gram negative
d. Staphylococci are Gram positive and grow in grape-like clusters, while streptococci which are also
Gram positive, grow in chains - Answer: d. Staphylococci are Gram positive and grow in grape-like
clusters, while streptococci which are also Gram positive, grow in chains
Frequency histograms and polygons are most useful for variables of what level of measurement?
1) Interval scale
2) Ratio scale
3) Nominal scale
4) Ordinal scale
a. 1, 2
b. 1, 3
c. 2, 3
d. 3, 4 - Answer: a. 1, 2
Which of the following is the correct order for disinfecting endoscopes?
a. High-level disinfection, rinse the scope with sterile water, flush the channels with 70 to 90 percent
alcohol, dry using forced air
b. Rinse the scope using sterile water, high-level disinfection, flush the channels with 70 to 90 percent
alcohol, dry using forced air
c. Flush the channels with 70 to 90 percent alcohol, rinse the scope using sterile water, high-level
disinfection, dry using forced air
d. Dry using forced air, high-level disinfection, flush the channels with 70 to 90 percent alcohol, rinse the
scope using sterile water - Answer: a. High-level disinfection, rinse the scope with sterile water, flush the
channels with 70 to 90 percent alcohol, dry using forced air
The lead IP is invited to participate in an employee health process improvement project. The goal of the
project is to improve influenza vaccination rates among employees. A multidisciplinary team is formed
, with representation from front-line employees. After conducting a root cause analysis (RCA), the team
develops a proposal for improvement to present to the facility leadership team. Which of the following
elements should be included as part of the proposal to most clearly communicate to the leadership
team the factors contributing to the facilities' current vaccination rate among employees?
a. A timeline for implementing improvement activities
b. A Pareto chart
c. A fishbone diagram with an explanation
d. A strategic plan - Answer: c. A fishbone diagram with an explanation
An IP wants to make external comparisons of the data collected relating to catheter-associated urinary
tract infections (CAUTI) in the Intensive Care Unit (ICU). Which of the formulas below will allow the IP to
accurately benchmark against nationally available data?
a. The number of ICU patients with urinary catheters in a given month divided by the number of urinary
tract infections identified in the same month times 1,000
b. The number of ICU urinary tract infections identified in a given month divided by the number of
urinary catheter days in the same month times 1,000
c. The number of urinary catheters used in the ICU in a given month divided by the number of urinary
tract infections identified in the same month times 1,000
d. The number of urinary tract infections identified in a given month divided by the total number of
patient days in the ICU in the same month times 1,000 - Answer: b. The number of ICU urinary tract
infections identified in a given month divided by the number of urinary catheter days in the same month
times 1,000
A 16-year-old male is brought to the ER with a fever, and a wound on his left leg that is draining purulent
material. He complains of swelling and pain. He is a quarterback on the high school football team and
has several turf burns on both legs. Past medical history is insignificant. The culture grows gram-positive
organisms in clusters. What is the most likely differential diagnosis?
a. Parasitic infection
b. Atypical mycobacterium infection
c. Methicillin resistant Staphylococcus aureus
d. Streptococcus pyogenes - Answer: c. Methicillin resistant Staphylococcus aureus