There are guidelines for both exposure in a health care setting and outside of a health care setting.

If you have a legitimate reason to believe you have been exposed to COVID-19 either directly (i.e., you have had close contact with someone who has been diagnosed with COVID-19) or secondarily (e.g., your co-habiting partner had direct contact with someone who has been diagnosed with COVID-19), you should initiate the CDC guidelines for self-quarantine, contact your health care provider and state health department for further guidance.

You may be required to self-isolate for 14 days and may not permitted to come into the care center or office. Please refer to the CDC’s updated guidelines:

https://www.cdc.gov/coronavirus/2019-ncov/php/risk-assessment.html

If you believe you have had a tertiary exposure to COVID-19 (e.g., your co-habiting spouse had direct contact with someone who, in turn, had direct contact with someone who has been diagnosed with COVID-19), and you are not exhibiting symptoms of the illness, you are not required to self-quarantine unless you develop symptoms of fever, cough or shortness of breath.

Also see CDC guidelines for exposure in a health care setting:

https://www.cdc.gov/coronavirus/2019-ncov/hcp/guidance-risk-assesment-hcp.html

Please visit this link for additional information:
Implementing Safety Practices for Critical Infrastructure Workers Who May Have Had Exposure to a Person with Suspected or Confirmed COVID-19