People who have been in close contact with someone found to have Covid-19 are now being traced and asked to self-isolate for a fortnight.
But what happens if a friend or someone who went to the same pub or restaurant as you tests positive?
What happens if I develop symptoms?
There you must give personal information, including:
- name, date of birth and postcode
- who you live with
- places you visited recently
- names and contact details of people you have recently been in close contact with
Close contacts are:
- people you've spent 15 minutes or more with at a distance of less than 2m (6ft)
- sexual partners, household members or people you have had face-to-face conversations with at a distance of less than 1m
Contact must have taken place within a nine-day period, starting 48 hours before symptoms appeared.
No-one contacted will be told your identity.
A parent or guardian must give permission for a call with under-18s to continue.
Must I provide contact details if eating out?
Organisations in certain sectors - such as pubs and restaurants - must collect and keep customer details for 21 days.
Giving personal information is voluntary and it is not the venue's responsibility to ensure it's correct.
If a customer tests positive, will the pub or restaurant have to close?
Possibly, but not necessarily.
Official government advice says an NHS Test and Trace call does not always mean a pub or restaurant must close.
It depends on the circumstances and when the infected person visited.
NHS Test and Trace could ask staff to:
- get tested for Covid-19
- take extra care with social distancing
- self-isolate "in some circumstances"
Local health-protection officials have the power to close establishments.
Pubs in England have been allowed to reopen since 4 July, although a couple had to temporarily close after customers tested positive.
What if I am contacted?
Anyone deemed at risk of infection must stay at home for 14 days from their point of contact with the infected person.
You must self-isolate, even if you don't have symptoms, to prevent the virus spreading.
You should order food or medicine online or by phone, or ask friends and family to leave it on your doorstep.
Other people you live with won't have to self-isolate, unless they also develop symptoms, but they must take extra care around you regarding social distancing and hand washing.
How is the tracing scheme going?
- 43,119 people who tested positive had been referred to the scheme
- 33,472 of them (77.6%) provided details of recent contacts
- the total number of contacts was 222,589 - of these, 184,703 (83%) were reached and asked to self-isolate
The proportion of people reached and asked to self-isolate has been falling since the programme launched.
Sage, which advises the government, has said that at least 80% of contacts would need to isolate for the test-and-trace system to be effective.
However, scientists from UCL and the London School of Hygiene and Tropical Medicine say that the scheme needs to reach a much higher proportion of the population in order to prevent a second wave when schools reopen.
The test-and-trace scheme has faced other criticisms. Plans for an app were abandoned in mid-June, with ministers now working towards a model based on Apple and Google technology.
Privacy campaigners say England's tracing scheme has broken a key data-protection law. The government conceded the initiative was launched without carrying out an assessment of its impact on privacy - but said there was no evidence of data being used unlawfully.
What about other parts of the UK?
Northern Ireland is the first part of the UK to roll out a smartphone contact-tracing app.
How do I avoid scammers?
England's NHS Test and Trace service will call only from 0300 0135 000. It will not ask you:
- for bank details/payments
- for details of any other accounts, such as social media
- to set up a password or PIN over the phone
- to call a premium-rate number, such as those starting 09 or 087
What about sick pay?
If people can't work from home, the government says employers must ensure any self-isolating employee receives sick pay and let them use paid leave days if they prefer.
Self-employed people who are self-isolating but can't work from home can apply for an income support scheme grant, the government says, although this is designed to cover three months' worth of profits.
- 23 April