References:
Transmission Dynamics of COVID-19 Outbreaks Associated with Child Care Facilities — Salt Lake City, Utah, April–July 2020
https://www.cdc.gov/mmwr/volumes/69/wr/mm6937e3.htm
Community and Close Contact Exposures Associated with COVID-19 Among Symptomatic Adults ≥18 Years in 11 Outpatient Health Care Facilities — United States, July 2020
https://www.cdc.gov/mmwr/volumes/69/wr/mm6936a5.htm