UAMS MICROBIOLOGY CASE STUDIES
EXAM 1 QUESTIONS AND ANSWERS
WITH COMPLETE SOLUTIONS
ALREADY PASSED!!!
Question 1: What procedure should be performed when a rapid bacterial
antigen test for Group A Streptococcus (GAS) yields a negative result?
A. Report the negative result and immediately discharge the patient without further
testing
B. Accept the rapid test result and set up a throat culture for GAS
confirmation
C. Repeat the rapid antigen test using a blood sample instead of a throat swab
✔✔ Correct Answer: B
Question 2: Which of the following laboratory tests is considered the most
reliable and definitive for determining the causative agent in a case of
bacterial meningitis?
A. Rapid latex agglutination test
B. Culture
C. Gram-stained smear alone
✔✔ Correct Answer: B
Question 3: Match the specimen collection procedure with the correct body
fluid: Arthrocentesis
A. Pleural fluid
B. Ascites fluid
C. Joint fluid
✔✔ Correct Answer: C
Question 4: Match the specimen collection procedure with the correct body
fluid: Paracentesis
,A. Middle ear fluid
B. Ascites fluid
C. Cerebrospinal fluid
✔✔ Correct Answer: B
Match the specimen collection method with the appropriate body fluid.
Thoracentesis
Pleural fluid
Match the specimen collection method with the appropriate body fluid.
Tympanocentesis
Middle ear fluid
Which of the following specimens has the highest priority?
Normally sterile body fluids (CSF, joint)
3 multiple choice options
What is the purpose of transport media?
Prevents drying of the specimen, prevents pH changes in the specimen, keeps the
organisms alive
, Which microscope objective is used to examine and enumerate host cells?
10x
Which microscope objective is used to examine and enumerate BACTERIA?
100x (oil)
Which gram stain smear indicates high quality specimen?
Many PMNs and few/no squamous epithelial cells
What does the presence of blue host cells in a gram stain smear indicate?
The smear was underdecolorized.
2 multiple choice options
For each media listed, classify it as either Selective or Non-Selective.
Chocholate agar (CHOC)
non-selective
For each media listed, classify it as either Selective or Non-Selective.
EXAM 1 QUESTIONS AND ANSWERS
WITH COMPLETE SOLUTIONS
ALREADY PASSED!!!
Question 1: What procedure should be performed when a rapid bacterial
antigen test for Group A Streptococcus (GAS) yields a negative result?
A. Report the negative result and immediately discharge the patient without further
testing
B. Accept the rapid test result and set up a throat culture for GAS
confirmation
C. Repeat the rapid antigen test using a blood sample instead of a throat swab
✔✔ Correct Answer: B
Question 2: Which of the following laboratory tests is considered the most
reliable and definitive for determining the causative agent in a case of
bacterial meningitis?
A. Rapid latex agglutination test
B. Culture
C. Gram-stained smear alone
✔✔ Correct Answer: B
Question 3: Match the specimen collection procedure with the correct body
fluid: Arthrocentesis
A. Pleural fluid
B. Ascites fluid
C. Joint fluid
✔✔ Correct Answer: C
Question 4: Match the specimen collection procedure with the correct body
fluid: Paracentesis
,A. Middle ear fluid
B. Ascites fluid
C. Cerebrospinal fluid
✔✔ Correct Answer: B
Match the specimen collection method with the appropriate body fluid.
Thoracentesis
Pleural fluid
Match the specimen collection method with the appropriate body fluid.
Tympanocentesis
Middle ear fluid
Which of the following specimens has the highest priority?
Normally sterile body fluids (CSF, joint)
3 multiple choice options
What is the purpose of transport media?
Prevents drying of the specimen, prevents pH changes in the specimen, keeps the
organisms alive
, Which microscope objective is used to examine and enumerate host cells?
10x
Which microscope objective is used to examine and enumerate BACTERIA?
100x (oil)
Which gram stain smear indicates high quality specimen?
Many PMNs and few/no squamous epithelial cells
What does the presence of blue host cells in a gram stain smear indicate?
The smear was underdecolorized.
2 multiple choice options
For each media listed, classify it as either Selective or Non-Selective.
Chocholate agar (CHOC)
non-selective
For each media listed, classify it as either Selective or Non-Selective.
