What Did Edward Jenner Discover About The Relationship Between Smallpox And Cowpox?

What Did Edward Jenner Discover About The Relationship Between Smallpox And Cowpox? For many years, he had heard the tales that dairymaids were protected from smallpox naturally after having suffered from cowpox. Pondering this, Jenner concluded that cowpox not only protected against smallpox but also could be transmitted from one person to another as a