User blog comment:Hazelcats/Apocalypse Colab/@comment-3389778-20130330151208/@comment-1719188-20130330151511

If they were mortal, they would probably have had to receive the cure at some point or have some kind of distantly related mortal blood, as demigods have a higher immunity to the disease and pretty much 90% of mortals either catch it or are able to carry it. You could do just a regular mortal, but there's more of a chance they'd fall ill.