MCQOPTIONS
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| 1. |
Jenner prepared the vaccine of smallpox by using _______ |
| A. | The attenuated pathogen of smallpox |
| B. | The killed pathogen of smallpox |
| C. | The attenuated pathogen of Cowpox |
| D. | Pathogens from Cowpox pustule |
| Answer» E. | |