What is contact tracing?

“Contact tracing is a method used to find and follow up with people who have been in close contact with someone who has tested positive for COVID-19. People who were around this individual are called contacts. By tracing the contacts of COVID-19 cases, having them self-isolate, if necessary, and testing, when appropriate, we can reduce the spread of coronavirus” Texas Deparment of State Health Services

https://www.dshs.state.tx.us/coronavirus/tracing.aspx