Name two methods which serve the purpose of early diagnosis is of bacterial or viral infection.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question:**
The question asks for two methods used for the early diagnosis of bacterial or viral infections.

2. **Identifying the Methods:**
- The first method is **Recombinant DNA Technology (rDNA Technology)**. This method involves taking DNA from two different organisms and combining them to create new genetic combinations. This can help in diagnosing genetic diseases, including those caused by bacterial or viral infections.
- The second method is the **ELISA Test (Enzyme-Linked Immunosorbent Assay)**. This test is primarily used to detect the presence of specific antigens or antibodies in a sample, which can indicate the presence of infections such as HIV.
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