The saliva works on fresh stains, but does it work on dried ones also?
For dried blood stains you can't beat "Biz". I would pull the spot out to separate that area from the rest of the quilt, put a rubber band around that "nipple", and suspend it into a small container of Biz solution. Half a teaspoon of Biz in a cup of cool water should suffice. Just let it soak for several hours or overnight. Color fast fabrics would not be affected.