Simple mod that adds disease immunity ability to all races.
------------------------------------------------------------------------

Update 04.June.2017

Added esp that only adds new ability without adding it to races. Its aimed for people that use mods that alter vanilla races or people that want to use it on custom races. Downside is that you now have to add the ability through console. Open the console and search for spell 'Disease Immunity'. Then add it with 
Player.addspell command.