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:D
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