Contact Tracing is the activity of systematically finding out all the people who came in contact with a person who has tested positive. This is kind of a necessary evil as it is critical in arresting and containing the spread of the virus.
Contact tracing helps protect by:
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Giving people the information they may have been exposed
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Providing information about the signs and symptoms so that they can monitor.
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Helping those exposed get tested.
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Advice self-quarantine to close contact.