Who discovered vaccination against small pox?

Options

A. Jenner
B. Pasteur
C. Lister
D. Mayer.

Answer

### Step-by-Step Text Solution:

1. **Understanding Smallpox**: Smallpox is a viral disease caused by the variola virus. It is characterized by fever and a distinctive skin rash.

2. **Identifying the Pioneer**: The discovery of vaccination against smallpox is attributed to Edward Jenner, an English physician.

3. **The Experiment**: In 1796, Edward Jenner conducted an experiment where he inoculated a 13-year-old boy with the vaccinia virus, which is related to cowpox. This was a significant step in developing a vaccine.

4. **Demonstrating Immunity**: After the inoculation, Jenner observed that the boy developed immunity to smallpox, indicating that exposure to the vaccinia virus could protect against the more dangerous smallpox virus.

5. **Development of the Vaccine**: By 1798, Jenner had developed the first smallpox vaccine, which laid the foundation for the field of vaccinology.

6. **Impact on Public Health**: The systematic implementation of smallpox vaccination throughout the 18th and 19th centuries led to the global eradication of smallpox, officially declared in 1979.

7. **Conclusion**: Therefore, the person credited with the discovery of vaccination against smallpox is Edward Jenner.

### Final Answer:
The correct answer is Edward Jenner.

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