When you have an infectious disease, or people think you might have one, contact tracing happens. The purpose of contact tracing is to find out who you have been in contact with. This is done to identify where you got the disease, tell the people you have been in contact with that they might be infected too, and stop the disease from spreading further.

You might be asked for information about the people you have been in contact with, so they can be told to get tested and treated if needed. This helps to limit the transmission of the infectious disease. Contact tracing is an important part of managing infectious diseases.