“Close contact” means being within 6 feet of a person with COVID-19 for about 15 minutes or more total over a 24-hour time period. Members of a household are considered to be close contacts.
A person who tests positive for COVID-19 has an infectious period of 48 hours before they begin showing symptoms.
Isolation is what you do if you have COVID-19 symptoms, or test positive. Isolation means you stay home and away from others (including household members) for the recommended period of time to avoid spreading illness.
Quarantine is what you do if you were exposed to COVID-19. Quarantine means you stay home and away from others for the recommended period of time in case you are infected and are contagious. Quarantine becomes isolation if you later test positive for COVID-19 or develop symptoms.