It is believed by the scientist that vaccinating the entire populace is not a good idea seeing that the vaccine has side effects.
What is smallpox?
Smallpox is a skin disease caused by a virus called the variola virus. It manifests by the development of blisters filled with pox on the skin of humans.
Smallpox led to the death of scores of numbers of people until it got eradicated by WHO in 1980.
Learn more about the Smallpox here
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