Which was the first vaccine developed?

Which was the first vaccine developed? Correct Answer Smallpox vaccine

The first vaccine was developed by Edward Jenner (in 1769) against the smallpox disease. This vaccine is named as Smallpox vaccine as it inhibits the action of smallpox disease. It is made from virus called vaccinia. Vaccinia is a poxvirus but is less harmful than smallpox. The smallpox contains live strains of vaccinia virus. This vaccine helps people develop their immunity against smallpox.  
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