Question 1

Which of the following best describes the principle behind a latex agglutination assay for detecting viral antigens in a patient sample?

Accepted Answer

Latex beads are coated with antibodies specific to a viral antigen and will agglutinate if the patient sample contains the corresponding viral antigen.

Question 2

A positive result in a latex agglutination test is indicated by which of the following?

Accepted Answer

Visible clumping (agglutination) of latex beads.

Question 3

In a latex agglutination assay, what would be the expected result if a patient sample does NOT contain antibodies against the viral antigen coated on the beads?

Accepted Answer

No agglutination; the solution remains evenly mixed.

Question 4

Which of the following statements about latex agglutination assays is TRUE?

Accepted Answer

They can be used to detect either viral antigens or patient antibodies, depending on what is coated on the beads.

Question 5

If a latex agglutination test is performed using beads coated with viral protein, and agglutination occurs when mixed with a patient’s serum, what does this indicate?

Accepted Answer

The patient’s serum contains antibodies specific to the viral protein.

Question 6

Which of the following best explains why a negative result (no agglutination) occurs in a latex agglutination assay?

Accepted Answer

The patient sample lacks the specific antigen or antibody required for the reaction.

Question 7

A laboratory technician wants to detect the presence of a specific virus in a patient’s sample using a latex agglutination assay. Which of the following should be coated on the latex beads?

Accepted Answer

Antibodies specific to the viral antigen.

Question 8

Which of the following is a limitation of latex agglutination assays?

Accepted Answer

They cannot distinguish between different strains of the same virus.

Question 9

Which of the following best describes the molecular interaction that leads to agglutination in a latex agglutination assay?

Accepted Answer

Antigen-antibody binding.

Question 10

Why is it important to include both positive and negative controls when performing a latex agglutination assay?

Accepted Answer

To confirm the specificity and reliability of the assay results.

Microbiology Study Guide: Viruses, Prions, Microbial Growth, Metabolism, and Epidemiology

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