The county also confirmed 15 new cases of the novel coronavirus on Thursday, pushing the total number of local cases confirmed since the pandemic began to 864.
Churchill Downs had planned to run the Derby with 40% crowd capacity, but track officials decided they couldn't responsibly bring fans onto the property. The race will go on Sept. 5 without spectators.
Despite a recent decrease in the seven-day rolling average of new cases, the county has seen an upward two-week trend, with 17.7% growth over the last 14 days.
