The number of active COVID-19 outbreaks in Colorado fell this week for the first time since late March.

The Colorado Department of Public Health and Environment defines an outbreak as two or more cases related to the same location or event. An outbreak will not be considered until four weeks have passed with no new cases.

The state reported that as of Wednesday, 859 outbreaks were considered to be ongoing, up from 870 a week earlier. At the previous low on March 31, the state reported 578 outbreaks.

Most settings had declining or roughly stable breakouts, with the exception of restaurants where 13 clusters were added.

The largest declines were seen in nursing homes, where outbreaks decreased by 14. Assisted living facilities, below 11; and schools, seven.

These three attitudes had seen the largest increase during the spring wave, with the majority of cases occurring among students and long-term care workers.