You are generally considered a close contact of someone who has COVID-19: if you are living with someone who has COVID-19; or if you have spent 4 hours or longer with someone in a home or a health or aged-care setting since they developed COVID-19; or under exceptional circumstances determined by states or territories State and territory governments determine the definition of a close contact and there are variations between them, so please check the definition made by the government of the state or territory that you are in.