Determining the quarantine period for someone that has been identified as a close contact to a positive COVID-19 case can sometimes be tricky and should be done so on a case-by-case basis. The following link might be helpful when determining a quarantine period. Scroll to the bottom of the page to view different scenarios.
CDC’s When to Quarantine: https://www.cdc.gov/
Please check out the resources provided on this helpful link from the Centers for Disease Control and Prevention https://www.cdc.gov/coronavirus/2019-ncov/community/index.html