If you’re over 50, you might have a small, rounded scar on your upper left arm. This tiny mark is a reminder of the smallpox vaccination that was once a standard procedure for people born before the 1970s. But have you ever wondered what this scar really signifies?
The smallpox vaccine was made from a live Vaccinia virus, which triggered an immune response to protect against the deadly Variola virus. When the vaccine was administered, it caused a series of reactions, including blisters, swelling, and eventually, a crusty scab. As the scab healed, it left behind a distinctive circular scar.
The vaccination process was quite an ordeal. Immediately after the shot, the area would swell slightly, only to return to normal after a few hours. Weeks later, a small lump would appear, resembling a mosquito bite. This lump would grow, crack open, and release fluid, eventually forming an ulcer.
As the ulcer healed, a scar would form, taking several weeks to complete. In some cases, this process would repeat itself, resulting in a more prominent scar.
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