Question: What steps should be taken if it is discovered that an employee who has been in the workplace has a confirmed case of COVID-19?

Answer passage (source: CDC):
page_title: General Business Frequently Asked Questions
section_headers: Suspected or Confirmed Cases of COVID-19 in the Workplace
What should I do if an employee has a respiratory illness?
section_content: Employees who appear to have COVID-19 symptoms, such as fever, cough, or
shortness of breath, upon arrival to work or become sick during the day with
COVID-19 symptoms should immediately be separated from other employees,
customers, and visitors and sent home.
CDC has a symptom self-checker chatbot called Clara that employers and employees may
find helpful. It has a series of questions and recommends what level of
medical care, if any, the user should seek. It is not intended to provide
diagnosis or treatment.

Reviewer feedback on this answer:
This does not address the question of what should be done if an employee has COVID-19, only in a hypothetical case.
This talks about employees with symptoms of COVID, and how to handle that, as opposed to how to handle a confirmed case of COVID. While there may be similarities, it does not address what to do if an employee is officially found to have COVID.

Reviewer ratings:
Bad
Could be Improved

Answer passage (source: CDC):
page_title: General Business Frequently Asked Questions
section_headers: Suspected or Confirmed Cases of COVID-19 in the Workplace
What should I do if an employee is suspected or confirmed to have COVID-19?
section_content: In most cases, you do not need to shut down your facility. But do close off
any areas used for prolonged periods of time by the sick person:

Wait 24 hours before cleaning and disinfecting to minimize potential for other employees being exposed to respiratory droplets. If waiting 24 hours is not feasible, wait as long as possible.
During this waiting period, open outside doors and windows to increase air circulation in these areas.

Follow the CDC cleaning and disinfection
recommendations:

Clean dirty surfaces with soap and water before disinfecting them.
To disinfect surfaces, use products that meet EPA criteria for use against SARS-Cov-2external iconexternal icon, the virus that causes COVID-19, and are appropriate for the surface.
Always wear gloves and gowns appropriate for the chemicals being used when you are cleaning and disinfecting.
You may need to wear additional personal protective equipment (PPE) depending on the setting and disinfectant product you are using.

In addition to cleaning and disinfecting, employers should determine which
employees may have been exposed to the virus and need to take additional
precautions:

Most workplaces should follow the Public Health Recommendations for Community-Related Exposure.
Critical infrastructure workplaces should follow the guidance Implementing Safety Practices for Critical Infrastructure Workers Who May Have Had Exposure to a Person with Suspected or Confirmed COVID-19.

Sick employees should follow CDC-recommended
steps. Employees
should not return to work until they have met the criteria to discontinue
home isolation
and have consulted with a healthcare provider and state or local health
department.
If an employee is confirmed to have COVID-19, employers should inform fellow
employees of their possible exposure to COVID-19 in the workplace but maintain
confidentiality as required by the Americans with Disabilities Act (ADA).

Reviewer feedback on this answer:
The answer gives a very detailed response to how a company should handle a COVID positive employee. It talks about several different approaches and situations.
This answer is relevant to the question in regards to steps to take when an employee has been confirmed as a COVID-19 case.

Reviewer ratings:
Excellent
Excellent

Answer passage (source: CDC):
page_title: General Business Frequently Asked Questions
section_headers: Suspected or Confirmed Cases of COVID-19 in the Workplace
What should I do if I find out several days later, after an employee worked, that they were diagnosed with COVID-19?
section_content: 
If it has been less than 7 days since the sick employee used the facility, clean and disinfect all areas used by the sick employee following the CDC cleaning and disinfection recommendations.
If it has been 7 days or more since the sick employee used the facility, additional cleaning and disinfection is not necessary. Continue routinely cleaning and disinfecting all high-touch surfaces in the facility.
Other employees may have been exposed to the virus if they were in “close contact” (within approximately 6 feet or 2 meters) of the sick employee for a prolonged period of time. 
Those who have symptoms should self-isolate and follow CDC recommended steps.
In most workplaces, those potentially exposed but with no symptoms should remain at home or in a comparable setting and practice social distancing for 14 days.
Critical infrastructure workers should follow Implementing Safety Practices for Critical Infrastructure Workers Who May Have Had Exposure to a Person with Suspected or Confirmed COVID-19. A critical infrastructure worker who is symptom-free and returns to work should wear a face mask at all times while in the workplace for 14 days after last exposure. Employers can issue facemasks or can approve employees’ supplied cloth face coverings in the event of shortages.


Employees not considered exposed should self-monitor for symptoms such as fever, cough, or shortness of breath. If they develop symptoms, they should notify their supervisor and stay home.


Reviewer feedback on this answer:
The answer goes into a large amount of detail in terms of answering the question. It lists very detailed information concerning several different possible situations involving COVID positive employees - including how much time has passed since the employee had been in the workplace.
This answer is both relevant to the question and answers the question concisely.

Reviewer ratings:
Excellent
Excellent