The cook Mary Mallon was a carries of which of the following diseases ?

Options

A. The disease caused by Salmonella typhi
B. The disease caused by streptococcus penumoniae.
C. The disease caused by Staphylococcus aureus.
D. The disease caused by Treponema pallidum.

Answer

To solve the question regarding the disease carried by Mary Mallon, also known as "Typhoid Mary," we can follow these steps:

### Step-by-Step Solution:

1. **Identify Mary Mallon's Profession**:
- Mary Mallon was a cook by profession.

2. **Understand the Term "Carrier"**:
- A carrier is an individual who harbors a pathogen without showing symptoms of the disease but can still transmit it to others.

3. **Research the Diseases Listed**:
- The options given are:
- Disease caused by Salmonella typhi
- Disease caused by Streptococcus pneumoniae
- Disease caused by Staphylococcus aureus
- Disease caused by Trypanosoma pallidum

4. **Link Mary Mallon to a Specific Disease**:
- Mary Mallon is famously known as a carrier of typhoid fever, which is caused by the bacterium Salmonella typhi.

5. **Confirm the Causative Agent**:
- Typhoid fever is specifically caused by Salmonella typhi, which is a pathogenic bacterium.

6. **Eliminate Incorrect Options**:
- The other options (Streptococcus pneumoniae, Staphylococcus aureus, and Trypanosoma pallidum) are not related to typhoid fever, confirming that they are incorrect.

7. **Select the Correct Answer**:
- Based on the information, the correct answer is the disease caused by Salmonella typhi.

### Final Answer:
Mary Mallon was a carrier of typhoid fever, which is caused by Salmonella typhi.

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