Our DC child care center follows the DC DOH for close contact quarantining. For 2 year olds and older who can start masks but are NOT vaccinated, they stay home for 5 days from the date of covid positive person's first day of symptoms (or covid test). Then test using antigen test on day 5. Return to care on days 6 thru 10 IF test was negative and cold will wear a mask inside and outside (even if center is mask optional, the close contact child's needs to be IN a mask)
For children less than 2 years of age, they need to stay home for 10 days, no test on day 5 to return on day 6.