Which disease is caused by Yersinia pestis

Options

A. plague
B. black fever
C. Xenopsylla cheopsis
D. all of these

Answer

**Step-by-Step Solution:**

1. **Identify the Organism**: The question asks about the disease caused by Yersinia pestis. First, we need to recognize that Yersinia pestis is a bacterium.

2. **Understand the Disease**: Yersinia pestis is known to cause a specific disease. We need to recall or research which disease is associated with this bacterium.

3. **Review the Options**: The question typically provides multiple-choice options. In this case, we need to evaluate each option to determine which one correctly identifies the disease caused by Yersinia pestis.

4. **Analyze the Correct Option**: Among the options, we find that the disease caused by Yersinia pestis is "plague". This is a well-documented fact in microbiology and infectious diseases.

5. **Consider the Vector**: It is also important to note that Yersinia pestis is transmitted through a vector, specifically the rodent flea (Ctenocephalides felis). This is relevant for understanding how the disease spreads but does not change the fact that the disease itself is plague.

6. **Eliminate Incorrect Options**: Other options such as "black fever" (caused by Leishmania donovani) or any other unrelated diseases can be eliminated as they do not relate to Yersinia pestis.

7. **Conclude the Answer**: Based on the analysis, the correct answer to the question "Which disease is caused by Yersinia pestis?" is "plague".

**Final Answer**: The disease caused by Yersinia pestis is **plague**.

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