http://www.adaa.org/AnxietyDisorderInfor/OCD.cfm
"Obsessive-Compulsive Disorder is characterized by uncontrollable obsessions and compulsions which the sufferer usually recognizes as being excessive or unreasonable. Obsessions are recurring thoughts or impulses that are intrusive or inappropriate and cause the sufferer anxiety. Some common obsessions are:
Thoughts about contamination, for example, when an individual fears coming into contact with dirt, germs or "unclean" objects"
I'm not suggesting any of you are OCD, but its an interesting resource for those of you truly living in fear..