Filth is not a disease. It's not a mutation. It's not chaos. It's grace, gift and true order. Filth is blind, righteous and unforgiving. It's your choice to be part of its forces or to become its fuel. Tertium non datum.
In the line 'Forces of Filth' you'll see some gorgeous in their disgust plague warriors and demons. If you like Lovecraft setting and also weak to Nurgle miniatures you will find great alternative ones here.