Immunity acquired after an infection is

Options

A. Active immunity
B. Passive immunity
C. Innate immunity
D. Both (2) and (3)

Answer

**Step-by-Step Solution:**

1. **Understanding Immunity**: Immunity refers to the ability of an organism's immune system to defend against pathogens (disease-causing organisms). It is crucial for maintaining health and preventing infections.

2. **Types of Immunity**: There are several types of immunity, but the question specifically asks about the immunity acquired after an infection.

3. **Active Immunity**:
- This type of immunity develops as a response to an infection or vaccination.
- When a person is infected with a pathogen, their immune system responds by producing antibodies specific to that pathogen.
- This process takes time but leads to long-lasting protection, as the immune system "remembers" the pathogen.

4. **Passive Immunity**:
- This immunity is different as it involves the introduction of antibodies from an external source, rather than the body producing them.
- An example of passive immunity is when antibodies are transferred from mother to child through breast milk or through injections.

5. **Innate Immunity**:
- This type of immunity is present from birth and does not require prior exposure to pathogens.
- It includes physical barriers (like skin) and immune responses that are always ready to fight infections.

6. **Conclusion**: Given the definitions and explanations, the immunity acquired after an infection is classified as **active immunity**.

**Final Answer**: The immunity acquired after an infection is **active immunity**.

---