The Unliving Swine of Borean Tundra seem to have a very interesting ability:

Nothing to fear, just make sure you have plenty of oinkment.

Of course, hilarious as it is, this is by no means an attempt by Blizzard to poke fun at a potentially deadly disease. This spell has been in game since the first beta version of WotLK came out about a year ago. Besides, there has been Swine Flu cases in humans as early as 1976.