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We carried out a retrospective cohort investigation of laboratory-confirmed patients with COVID-19 in King County, Washington, United States Of America, who obtained 9-1-1 EMS responses from 14 February 2020 to 26 March 2020. We evaluated dispatch, EMS and general public wellness surveillance records to evaluate the temporal commitment between exposure and programmatic modifications to EMS operations built to identify high-risk clients, protect the workforce and con