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Viral Testing: How Virus are Detected

At the hit of covid19, it will be of interest for you to know, how virus  are detected.

viral test is done to find infection-causing viruses. Viruses only grow in living cells. Viruses cause disease by destroying or damaging the cells they infect, damaging the body's immune system, changing the genetic material (DNA) of the cells they infect, or causing inflammation that can damage an organ. Viruses cause many types of diseases, such as human immunodeficiency virus (HIV), cold sores, chicken pox, measles, flu (flu) and some types of cancer. You can watch the video  below on how virus are  detected

Types of Viral Testing: How Viruse are Detection 

1. Antibody test. Antibodies are substances made by the body's immune system to fight a specific viral infection.

The antibodies attach to a cell infected by the virus and cause the virus to be destroyed. This test looks for antibodies against a specific viral infection.

It is usually done on a blood sample. If the antibody is found, this test can show whether a person has been infected recently or in the past.

2. Viral antigen detection test. Viral antigens develop on the surface of cells infected with a specific virus. A viral antigen detection test is performed on a tissue sample that may be infected.

Specially tagged antibodies that attach to those viral antigens are mixed with the sample. The tagged antibodies can be seen using a special lamp (or other method). If the tagged antibodies are attached to the cells, the cells are infected with the virus.

3. Viral culture. This is a test to find a virus that can cause an infection. A sample of body fluid or tissue is added to certain cells that are used to grow a virus. If no virus infects the cells, the culture is negative.

If a virus that can cause infection infects the cells, the culture is positive. It can take several weeks for a viral culture to show results.

4. Viral DNA or RNA detection test. This type of test searches for the genetic material (DNA or RNA) of a specific virus using a tissue or blood sample or other fluid (such as spinal fluid). This test can detect the exact virus causing an infection.

Note: Different types of samples are used for a viral test and detection, including blood, urine, stool (stool), organ tissue, spinal fluid, and saliva. The type of sample used for the test depends on the type of infection that may be present.

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