One of the common symptoms observed in people infected with dengue fever is

Options

A. significant decrease in RBC count
B. significant decrease in WBC count
C. significant decrease in platelets count
D. significant increase in platelets count

Explanation

### Step-by-Step Solution:

1. **Understanding Dengue Fever**: Dengue fever is a viral disease caused by the dengue virus, which is transmitted primarily by mosquitoes. It is important to recognize that this condition is associated with various symptoms and changes in blood parameters.

2. **Identifying Symptoms**: One of the key symptoms of dengue fever is a change in blood cell counts. The question asks about the common symptoms observed in individuals infected with this virus.

3. **Analyzing Blood Cell Counts**: In dengue fever, the body experiences a significant decrease in certain blood components. The options provided include:
- Significant decrement of RBC count
- Significant decrease in WBC count
- Significant decrease in platelets count
- Significant increase in platelets count

4. **Focusing on Platelets**: The most notable change in blood parameters during dengue fever is thrombocytopenia, which refers to a significant decrease in platelet count. Platelets (thrombocytes) are crucial for blood clotting, and their reduction can lead to increased bleeding risks.

5. **Conclusion**: Therefore, the common symptom observed in people infected with dengue fever is a **significant decrease in platelets count**.