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Explains how the contact tracing system works if you have tested positive for coronavirus.

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First published:
15 June 2020
Last updated:


If you’ve tested positive for coronavirus (COVID-19), you must self-isolate for 10 days from when your symptoms started (or if you don’t know, from the day you took your test), to make sure that you don’t spread the virus.

You must still self-isolate even if you have been fully-vaccinated or are under 18. There are no exemptions in this case. The NHS Wales Test, Trace, Protect service will contact you by phone to give you advice on self-isolation and to find out who you have been in close contact with recently. If you miss their call, they’ll call you back the following day.

Calls will usually come from this number: 029 2196 1133.

For children under 16 the contact tracer can speak to either of the following:

  • an adult on behalf of the child
  • the child if their parent or guardian has consented

During your self-isolation period you and everyone else in your household must stay at home for the whole time you are self-isolating, unless members of your household are exempt. There are some emergency reasons when you can leave self-isolation, including seeking medical help, where urgent or advised by a medical professional.

What NHS Test Trace Protect contact tracers will ask you

Contact tracers will ask you:

  • where you’ve been recently
  • who you’ve been in close contact with, up to 14 days before your symptoms started

This will help to identify where you may have caught the virus. It will also help to identify anyone you may have passed the virus to. Contact tracers will explain what this means and talk you through the process. This information will help us contact those at risk of becoming ill and spreading the virus to give them appropriate advice. This is in the interests of protecting your health and the health of your contacts. 

The contact tracer will ask if you want to provide information over the phone or on the NHS Test, Trace, Protect service website. They’ll ask if you prefer to communicate in Welsh or English. If you choose to provide information via the website, we will send a secure one-time code to you via text message. This will include the link to the form you need to complete. If you cannot use the website, contact tracers will take your information over the phone.

By working together we can help reduce the spread of the disease, so it’s important that you:

  • confirm your name, address, postcode, telephone numbers, email address, date of birth, disability and ethnicity data
  • provide names/addresses of the people you’ve come into close contact with and places you’ve visited

If you choose to submit your details by completing the website form, you’ll need to provide a mobile number.

If you choose to submit your details over the telephone, then you’ll be asked to choose between providing a home number or mobile number.

Further information on contact tracing and support for self-isolation can be found at contact tracing: your questions.