Name a molecular diagnostic technique to detect the presence of a pathogen in its early stage of infection ?

Explanation

**Step-by-Step Text Solution:**

1. **Identify the Question:** The question asks for a molecular diagnostic technique that can detect the presence of a pathogen in its early stage of infection.

2. **Name the Techniques:** Two commonly used molecular diagnostic techniques are:
- Polymerase Chain Reaction (PCR)
- Enzyme-Linked Immunosorbent Assay (ELISA)

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