Expand the following :
(a) AIDS (b) ELISA

Explanation

### Step-by-Step Text Solution

**Step 1: Expand AIDS**
- The full form of AIDS is **Acquired Immunodeficiency Syndrome**.
- This condition is characterized by a severe weakening of the immune system, making the body more susceptible to infections and diseases.
- AIDS is primarily caused by the Human Immunodeficiency Virus (HIV), which is a retrovirus. Retroviruses are characterized by their genetic material being composed of RNA.

**Step 2: Expand ELISA**
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