Obsessive-compulsive disorder (OCD) is often misunderstood as being about cleanliness or liking things labeled and arranged a certain way. In reality, OCD is defined by:

* Obsessions: intrusive, unwanted thoughts, images, or urges

* Compulsions: repetitive behaviors or mental acts (rituals) done to
  reduce anxiety caused by those thoughts

OCD has some common themes (harm, moral scrupulosity, contamination, sexual, false memory, just right, etc.), but it isn’t really about germ