Have you ever noticed a small, round, slightly sunken scar on someone’s upper arm and wondered where it came from?
For many older adults, that unusual mark isn’t an injury or a birthmark.
It may be a reminder of one of the most important achievements in the history of medicine: smallpox vaccination.
Why Did the Smallpox Vaccine Leave a Scar?
The smallpox vaccine was administered differently from most vaccines people receive today.
Instead of using a conventional single injection, the vaccination technique involved a special bifurcated needle that made several
