What is the basis of detection using ELISA test?

Explanation

### Step-by-Step Solution:

1. **Understanding ELISA**: The ELISA test stands for Enzyme-Linked Immunosorbent Assay. It is a widely used laboratory technique for detecting and quantifying substances such as proteins, hormones, and antibodies.

2. **Purpose of ELISA**: The primary use of the ELISA test is for the detection of various disorders and diseases. A notable application is in the diagnosis of AIDS, which is caused by the Human Immunodeficiency Virus (HIV).

3. **Role of Pathogens and Antibodies**: When a pathogen (like HIV) enters the body, it triggers the immune response, leading to the production of specific antibodies. These antibodies are proteins that the immune system creates to identify and neutralize pathogens.

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