I am in the group that wonders whether the staph actually came from the fabric. Staph is on everyone's skin. To wash or not to wash is a personal decision everyone needs to decide on for themselves. i like to prewash so that if I make something there are no tragedies the first time my quilt recipient washes the quilt. if something is going to happen with the fabric, I want it to happen before I put all the time and effort into a quilt. Believe me, I have had experiences with not prewashing and don't want repeats. The one exception i would make, is to advise all to prewash fabrics for a baby quilt, or wash the quilt before giving it away.