Differentiate between infectious and noninfectious diseases.

Explanation

### Step-by-Step Solution:

1. **Definition of Infectious Diseases**:
- Infectious diseases are illnesses caused by pathogens such as bacteria, viruses, and protozoans.
- They are characterized by their ability to be transmitted from one person to another.

2. **Transmission**:
- Infectious diseases are easily spread through direct or indirect contact with an infected individual.
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