Ques : Edward Jenner developed smallpox vaccine by observing that a person who previously has caught which of these infections did not catch smallpox?
A. Chickenpox
B. Monkeypox
C. Sheeppox
D. Cowpox
Ans : D. Cowpox
Ques : Edward Jenner developed smallpox vaccine by observing that a person who previously has caught which of these infections did not catch smallpox?
