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Darina [25.2K]
3 years ago
8

Most americans born before 1970 have a permanent scar on their shoulders from the smallpox vaccine. Why don't younger americans

have one?
Social Studies
1 answer:
Ivanshal [37]3 years ago
8 0

I believe the answer is: Smallpox has been eradicated by a worldwide vaccination program

Vaccines develop an immunity toward the virus. In order to survive, virus need to obtain a host so they could replicate. Due to the vaccine, the viruses cannot find these hosts. Because of this, smallpox virus started to gradually decreased and eventually eradicated.

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