COVID-19 Antibody Testing Concepts

The video explains SARS-CoV-2, the virus causing COVID-19, and how the immune system produces antibodies in response. It details the COVID-19 antibody test procedure, which detects IgM and IgG antibodies using a cassette-based system. The test kit's mechanism involves lateral flow immunochromatographic assay with gold nanoparticles. The video also covers interpreting test results, including positive, negative, and invalid outcomes, and discusses the limitations of antibody detection.

What is the primary function of antibodies in the immune system?

• To attack healthy cells

• To decrease immune response

• To neutralize pathogens

• To produce more viruses

Which type of antibody is produced first in response to a viral infection?

• IgM

• IgG

• IgE

• IgA

How long after symptom onset are IgG antibodies typically detectable?

• 14-21 days

• 7-14 days

• 4-7 days

• 1-3 days

What is the first step in performing a COVID-19 antibody test using a cassette?

• Add blood to the cassette

• Place the cassette on a level surface

• Puncture a finger

• Add buffer drops

What role do gold nanoparticles play in the COVID-19 antibody test?

• They neutralize the virus

• They increase the test speed

• They serve as a visual indicator

• They act as a buffer

What is the purpose of the rabbit IgG antibodies in the test kit?

• To bind with IgM antibodies

• To enhance the red color

• To detect human antibodies

• To serve as a control for test validity

What does a positive IgM and negative IgG result indicate?

• Past infection

• Ongoing infection

• Recent infection

• No infection

What does a negative test result imply?

• The person may have been infected but antibodies are not detectable

• The person has never been infected

• The person has a recent infection

• The person is definitely not infected

What should be done if the quality control seal line does not show a red color?

• Consider the test negative

• Consider the test positive

• Retest the sample

• Ignore the result

Why might some people not develop detectable antibodies after a COVID-19 infection?

• Because they were never infected

• Because antibodies do not last long

• Because the test is inaccurate

• Due to a weak immune system