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Exam 15: Diagnosing Infections

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Question 21

Multiple Choice

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Titer is the amount of

A) antigen in serum.
B) antibody in serum.
C) WBC in serum.
D) complement in serum.
E) memory cells in serum.

F) A) and D)
G) B) and C)

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Question 22

Multiple Choice

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Which test is used to confirm scarlet fever?

A) ELISA
B) Western blot
C) Widal test
D) complement fixation
E) antistreptolysin O

F) A) and B)
G) A) and C)

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Question 23

Multiple Choice

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The primary advantage of genotypic methods of identification is

In precipitation tests,the antigen

A positive indirect ELISA result requires

Please read the clinical scenario, and then answer the question that follow to become familiar with the traditional NCLEX question format. Halley is a 62-year-old female, previously healthy with no significant medical history, and no known allergies. She is admitted to your medical-surgical floor for an infectious disease work-up. Halley has been experiencing generalized pain and nausea for the past 3 weeks, and recently developed a fever. The doctors at the urgent care center, and then the emergency department, were perplexed by her presentation. You have been ordered to perform several tests: complete blood count (CBC) , C-reactive protein (CRP) , eosinophil sedimentation rate (ESR) , blood culture, urine culture, and a lumbar puncture with cerebral spinal fluid (CSF) culture and cell count. You are also collecting a sputum culture, as well as swabbing her nose with a culturette, and performing a nasal wash. -Halley's CRP came back markedly elevated.What finding does this point to?

The property of a test to detect only a certain antibody or antigen,and not to react with any others is

Specimen collection

Serotyping of pneumococcus based on capsular polysaccharide is performed in

Which test is used to confirm rheumatic fever?

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

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

Which of the following is involved in the in vitro diagnostic testing of serum?

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

Horseradish peroxidase and alkaline phosphatase are enzymes used in _____ tests.

Please read the clinical scenario, and then answer the question that follow to become familiar with the traditional NCLEX question format. Halley is a 62-year-old female, previously healthy with no significant medical history, and no known allergies. She is admitted to your medical-surgical floor for an infectious disease work-up. Halley has been experiencing generalized pain and nausea for the past 3 weeks, and recently developed a fever. The doctors at the urgent care center, and then the emergency department, were perplexed by her presentation. You have been ordered to perform several tests: complete blood count (CBC) , C-reactive protein (CRP) , eosinophil sedimentation rate (ESR) , blood culture, urine culture, and a lumbar puncture with cerebral spinal fluid (CSF) culture and cell count. You are also collecting a sputum culture, as well as swabbing her nose with a culturette, and performing a nasal wash. -Halley's urine for culture was collected using a clean-catch method.After inoculation and incubation,several organisms were identified in amounts that were specified as normal microbial flora.What does this mean?

The Quellung test involves

Serological tests should have low sensitivity and specificity.

When minute samples of DNA need to be genetically analyzed for identification purposes,which test can be effectively used?

Please read the clinical scenario, and then answer the question that follow to become familiar with the traditional NCLEX question format. Tyler is a 16-year-old male who has come into your clinic with a low-grade fever, and large and painful red sores around his lips. He has a PCR test pending that was swabbed from the sores, as well as a blood culture with Gram stain, and nasal wash for examination by microscope. -Tyler's results came back as being positive for Herpes simplex virus.Tyler's mother is mortified,as she does not believe her son is sexually active.After you explain that the presence of HSV does not imply sexual contact,you offer that the results are accurate.Which of the following reasons best demonstrates this line of thinking?