How was vaccination developed by Jenner superior to the variolation practised in earlier times?

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Jenner's vaccination against smallpox using cowpox as a milder infection was superior to variolation because variolation actually involved intentionally infecting individuals with smallpox, which could be fatal in some cases. This meant that variolation was either "kill" or "cure," while vaccination was a much safer method of providing immunity.

How Was Vaccination Developed by Jenner Superior to the Variolation