Chagas fever/american sleeping sickness, transmitted by bugs is caused by

Options

A. Trypanosoma cruzi
B. T. brucei
C. T. evansi
D. Leishmania tropica

Answer

**Step-by-Step Solution:**

1. **Identify the Disease**: The question asks about Chagas fever, also known as American sleeping sickness.

2. **Understand Transmission**: Chagas fever is transmitted by certain types of bugs, specifically known as "kissing bugs" or the triatominae.

3. **Determine the Causative Agent**: The next step is to identify the organism that causes Chagas fever. The options provided are:
- Trypanosoma cruzi
- Trypanosoma brucei
- Trypanosoma evansi
- Leishmania tropica

4. **Analyze the Options**:
- **Trypanosoma cruzi** is known to be the causative agent of Chagas disease.
- **Trypanosoma brucei** is responsible for African sleeping sickness, not Chagas.
- **Trypanosoma evansi** is associated with other diseases but not Chagas.
- **Leishmania tropica** causes leishmaniasis, not Chagas.

5. **Select the Correct Answer**: Based on the analysis, the correct answer is **Trypanosoma cruzi**.

6. **Summarize the Information**: Chagas fever, or South American trypanosomiasis, is caused by Trypanosoma cruzi and transmitted by kissing bugs (triatominae).

**Final Answer**: The causative agent of Chagas fever (American sleeping sickness) is **Trypanosoma cruzi**.

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