Health Departments: Interim Guidance on Developing a COVID-19 Case Investigation & Contact Tracing Plan [open pdf - 931KB]
From the Introduction: "Case investigation is the identification and investigation of patients with confirmed and probable diagnoses of COVID-19 [coronavirus disease 2019], and contact tracing is the subsequent identification, monitoring, and support of their contacts who have been exposed to, and possibly infected with, the virus. Prompt identification, voluntary quarantine (hereby referred to as 'self-quarantine' in this document unless otherwise noted), and monitoring of these COVID-19 contacts can effectively break the chain of disease transmission and prevent further spread of the virus in a community. While case investigation and contact tracing for COVID-19 may be new, health departments and frontline public health professionals who perform these activities have experience conducting these activities for tuberculosis, sexually transmitted infections, HIV, and other infectious diseases."
Centers for Disease Control and Prevention: https://www.cdc.gov/