Defined as:

A. characterised by the prescence of obsessions, compulsions or both

obsessions
need to be safe in house
contamination of hands

compulsion
i will say close and open door 20 times to clear it
need to heavily clean body

B. needs to be time consuming or debilitating

additional intrusive thoughts
vivid images of something unpleasant or intrusive thoughts

Other factors:

Symptoms are:

Physiological:
Cognitive:
Affective:
Behavioural:

Prevalence: (community), (clinical)

Treatment options: