What does a job in contact tracing involve?

A job in contact tracing involves identifying, assessing, and managing people who have been exposed to a disease to prevent onward transmission. For example, contact tracing has been used to break the transmission chain of COVID-19 and is an essential public health method for controlling the virus.
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The tasks often involve a good deal of detective work, by cold calling people who may have come into contact with someone who has a particular virus.