If you have had close contact with someone who has COVID-19, you are required (per NAC 441A.280) to maintain quarantine (stay home and away from others).
The CDC continues to endorse quarantine for 14 days after your last close contact as the safest option to reduce the risk of spreading illness. However, according to new CDC guidance you may end quarantine after 10 days if you do not have any symptoms during this 10-day period. If symptoms develop at any time, you must isolate yourself away from others and get tested.
After your quarantine period you should continue to limit your contact with others as much as possible, and always wear a face mask when you are around people who do not live with you.
The state of Nevada requires people who have had close contact with someone who has COVID-19 to sign a Declaration of Self-Quarantine. Sign the declaration here.