Contra Costa County Releases COVID-19 90 Days in Review May 5, 2020 General COVID-19, Public Health Contra Costa County Health Services released an overview of the progression of the COVID-19 pandemic in Contra Costa County, " COVID-19 90 Days in Review: Contra Costa County's Pandemic Response." The report highlights work that CCCHS has done to minimize the spread of COVID-19 in the county, as well as provide additional tools to continue slowing the spread of the virus.