Question 1

When antibodies or other substances in serum cross-react with the test reagents, a false positive result can occur.

Accepted Answer

A) True 
 B)False

Question 2

Depending on the organism, direct examination of a specimen is often the most rapid diagnostic tool used in the clinical microbiology lab. You have a sample of pus from a patient's penis. What will be the easiest test to con?rm that the patient has gonorrhea?

Accepted Answer

A)   Microarray
B)   ELISA
C)   Agglutination reaction
D)   Gram stainE) All of the above
F) A) and B)

Question 3

Which test is the conﬁrming test for people who initially tested antibody-positive in the screening ELISA test?

Accepted Answer

A)   Radioimmunoassay (RI
A)  
B)   Immunelectrophoresis
C)   Western blot
D)   Quellung test
E)   Ouchterlony double diffusionF) A) and E)
G) A) and C)

Question 4

You would like to identify as many bacterial species as possible in the human mouth. Why is biochemical testing not the most eﬃcient and accurate method of completing this task?

Accepted Answer

A)   Since you do not know the growth characteristics and metabolic properties of the bacteria in the mouth, you cannot determine all varieties of media to use for isolation and culture.
B)   Bacteriological media is very expensive, particularly when you would have to use a variety of types to identify the different bacteria.
C)   Bacteria in the mouth are diﬃcult to grow because of the adverse conditions in the oral habitat.
D)   Biochemical testing, using a variety of media, is inaccurate. It has been replaced by more advanced testing procedures.E) B) and D)
F) A) and B)

Question 5

Serological testing relies upon ______.

Accepted Answer

A)   the speciﬁcity of the Fc region of antibodies
B)   the speciﬁcity of the variable regions of antibodies
C)   a very high viral or bacterial load in the patient
D)   a patient who is not immunocompromisedE) A) and B)
F) None of the above

Question 6

The polymerase chain reaction can be used for identiﬁcation of ______.

Accepted Answer

A)   proteins
B)   growth characteristics of microorganisms
C)   microorganisms
D)   antibodies in the patient's serumE) All of the above
F) A) and D)

Question 7

Antibiotics are often added to biochemical media to restrict the growth to only those organisms that are being looked for in the specimens.

Accepted Answer

A) True 
 B)False

Question 8

The testing method involving the separation of serum proteins by electrophoresis, their subsequent transfer to special ﬁlters, and then probing with patient sera is called ______.

Accepted Answer

A)   the Quellung test
B)   a radioimmunoassay (RI
A)  
C)   immunelectrophoresis
D)   the Western blot
E)   Ouchterlony double diffusionF) A) and E)
G) A) and C)

Question 9

Rickettsial infections can be diagnosed by the ______.

Accepted Answer

A)   latex agglutination test
B)   antistreptolysin O test
C)   Weil-Felix agglutination test
D)   rapid plasma reagin testE) B) and D)
F) B) and C)

Question 10

A urine specimen obtained from a patient went to the microbiology lab for a bacterial culture and antibiotic sensitivity testing. The specimen sat out on the processing counter for a couple of hours before being cultured. Twenty fours hours later, the lab report goes into the computer---over 100,000 bacterial cells per milliliter of urine. Which statement is an accurate assessment of these
Results?

Accepted Answer

A)   Urine samples have to be taken from the kidney in order to get a true bacterial count.
B)   Not all bacteria will grow on bacteriological media, so the total count is grossly underestimated.
C)   Urine is a sterile ?uid as it leaves the body, so it is likely that the specimen was mishandled by the nursing staff when the sample was obtained.
D)   The bacterial count is not accurate since the culture sat without refrigeration.E) A) and B)
F) B) and C)

Question 11

The indirect ELISA test is commonly used to diagnose infections caused by all of the following except ______.

Accepted Answer

A)   rubella virus
B)   hepatitis C virus
C)   HIV
D)   Helicobacter
E)   hepatitis A virusF) A) and B)
G) A) and C)

Question 12

The primary advantage of genotypic analysis for identiﬁcation is that ______.

Accepted Answer

A)   it is easier than any other method
B)   it is less expensive than other methods
C)   culturing of the organism is not required
D)   it is widely availableE) None of the above
F) A) and D)

Question 13

Which of the following is not a genotypic method of identiﬁcation?

Accepted Answer

A)   Direct antigen testing
B)   DNA analysis with probes
C)   rRNA sequencing
D)   Pulse-ﬁeld gel electrophoresis
E)   G + C compositionF) B) and D)
G) D) and E)

Exam 17: Diagnosing Infections

The polymerase chain reaction can be used for identiﬁcation of ______.

Correct Answer
verified

Serological testing relies upon ______.

Correct Answer
verified

Which test is the conﬁrming test for people who initially tested antibody-positive in the screening ELISA test?

Correct Answer
verified

The indirect ELISA test is commonly used to diagnose infections caused by all of the following except ______.

Correct Answer
verified

The testing method involving the separation of serum proteins by electrophoresis, their subsequent transfer to special ﬁlters, and then probing with patient sera is called ______.

Correct Answer
verified

Antibiotics are often added to biochemical media to restrict the growth to only those organisms that are being looked for in the specimens.

Correct Answer
verified

Which of the following is not a genotypic method of identiﬁcation?

Correct Answer
verified

When antibodies or other substances in serum cross-react with the test reagents, a false positive result can occur.

Correct Answer
verified

Rickettsial infections can be diagnosed by the ______.

Correct Answer
verified

The primary advantage of genotypic analysis for identiﬁcation is that ______.

Correct Answer
verified

Correct Answer
verified

Depending on the organism, direct examination of a specimen is often the most rapid diagnostic tool used in the clinical microbiology lab. You have a sample of pus from a patient's penis. What will be the easiest test to con?rm that the patient has gonorrhea?

Correct Answer
verified

You would like to identify as many bacterial species as possible in the human mouth. Why is biochemical testing not the most eﬃcient and accurate method of completing this task?

Correct Answer
verified

Exam 17: Diagnosing Infections

The polymerase chain reaction can be used for identiﬁcation of ______.

Correct AnswerverifiedShow Answer

Serological testing relies upon ______.

Correct AnswerverifiedShow Answer

Which test is the conﬁrming test for people who initially tested antibody-positive in the screening ELISA test?

Correct AnswerverifiedShow Answer

The indirect ELISA test is commonly used to diagnose infections caused by all of the following except ______.

Correct AnswerverifiedShow Answer

The testing method involving the separation of serum proteins by electrophoresis, their subsequent transfer to special ﬁlters, and then probing with patient sera is called ______.

Correct AnswerverifiedShow Answer

Antibiotics are often added to biochemical media to restrict the growth to only those organisms that are being looked for in the specimens.

Correct AnswerverifiedShow Answer

Which of the following is not a genotypic method of identiﬁcation?

Correct AnswerverifiedShow Answer

When antibodies or other substances in serum cross-react with the test reagents, a false positive result can occur.

Correct AnswerverifiedShow Answer

Rickettsial infections can be diagnosed by the ______.

Correct AnswerverifiedShow Answer

The primary advantage of genotypic analysis for identiﬁcation is that ______.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Depending on the organism, direct examination of a specimen is often the most rapid diagnostic tool used in the clinical microbiology lab. You have a sample of pus from a patient's penis. What will be the easiest test to con?rm that the patient has gonorrhea?

Correct AnswerverifiedShow Answer

You would like to identify as many bacterial species as possible in the human mouth. Why is biochemical testing not the most eﬃcient and accurate method of completing this task?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified