Widal test detects the presence of antibodies against which pathogen?

Options

A. Vibrio cholerae
B. Paramyxovirus
C. Salmonella typhi
D. Influenza virus

Answer

To answer the question regarding the Widal test, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Widal Test**: The Widal test is a serological test used to detect the presence of specific antibodies in the blood serum of a patient. It is primarily used to diagnose typhoid fever.

2. **Identifying the Pathogen**: The Widal test specifically detects antibodies against the pathogen *Salmonella typhi*, which is the causative agent of typhoid fever.

3. **Reviewing the Options**:
- **Vibrio cholerae**: This is the causative agent of cholera, not detected by the Widal test.
- **Paramyxovirus**: This virus is associated with diseases like measles and mumps, not relevant to the Widal test.
- **Salmonella typhi**: This is the correct pathogen associated with the Widal test.
- **Influenza virus**: This virus is responsible for the flu and is not related to the Widal test.

4. **Conclusion**: Based on the identification of the pathogen and the purpose of the Widal test, we conclude that the Widal test detects the presence of antibodies against *Salmonella typhi*.

### Final Answer:
The Widal test detects the presence of antibodies against *Salmonella typhi*.

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