By Charlotte Webster-
The NHS Covid contact tracing app used in England and Wales may need to change as coronavirus restrictions change, Transport Secretary Grant Shapps said.
The app currently works by alerting users who have been near other app users who have then tested positive for coronavirus, and instructing those people to self isolate for a full 10 days.
England is scheduled to end the 1m-plus rule on 19 July may mean the app’s sensitivity needs to be reduced, he said.
The app detects the distance between users and the length of time spent in close proximity – currently 2m or less and more than 15 minutes.
The system allows people who test positive to anonymously share their test result, triggering alerts for those detected as close contacts in the days before the test.
Coronavirus restrictions are set to end on 19 July but the requirement to self-isolate if you have had both vaccine doses will only stop on 16 August, raising fears that millions of people would be asked to self-isolate this summer as people mixed more.
The hospitality industry and NHS trusts have warned MPs the knock-on effect for the economy and workplaces could be huge.
One solution being explored could be to change the sensitivity of the app, so it would tell people to self-isolate only after closer and more prolonged contact.
Sources at the app developers told the BBC they have not yet been asked to do this, although they are planning a change from 16 August when people would be able to record that they were fully vaccinated to turn off the self-isolation countdown timer.
Mr Shapps told BBC Breakfast: “As our restrictions change, of course the app needs to change. Things like replacing the 1m-plus rule on 19 July might well lead to a review of the way the app itself needs to function.”
But he said the app was still “very important as one of the tools in our armoury”. He said there were still large numbers of people downloading it and said he had not seen any data showing people were deleting it.
The most recent figures for the last week of June show an extra 300,000 downloads, bringing the total to more than 26 million, but it is not known how many people are active users.
“It’s in our interests as a society to carry on doing the things that protect each other,” Mr Shapps said.
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Analysis box by Zoe Kleinman, technology reporter
Technically, it wouldn’t be very difficult to tweak the app to make it less “sensitive” – the hard bit is working out exactly what those tweaks should be.
Currently, two phones with the app installed, exchange a digital handshake, via bluetooth, every five minutes. It registers how far apart they are, and for how long.
If one of those phones then goes on to report a positive Covid test, other phones who were two metres away or less, for a duration of 15 minutes during a 24 hour period, are likely to receive an isolation alert.
As we have learned more about the virus, other factors have also been incorporated such as how infectious the person was likely to have been at the time the two phones were in close proximity.
Changing those parameters would be straightforward.
But fundamentally it’s the volume of cases which are driving the volume of isolation alerts, not the app itself. In the last week of June there were 356,000 alerts, triggered by 61,000 positive test reports – that’s about six app users isolating per Covid case.
When you look at it like that, it doesn’t sound so excessive.
And because of the app’s focus on privacy nobody, including the government, the police and the NHS knows who has been “pinged” – making it legally unenforceable.
Labour leader Sir Keir Starmer said he was concerned about the possible changes, saying weakening the app would undermine the track and trace system the government had spent billions on.
Starmer said: “This feels like taking the batteries out of the smoke detector and that is never a good idea.”
A Downing Street source stressed people were still being encouraged to self-isolate if they got an alert, adding the Department of Health’s statement that the app was advisory was consistent with the government’s message to “act cautiously, especially as we know cases will rise”.
Dr Jenny Harries, the head of the new UK Health Security Agency, told MPs on Thursday she was “aware that people are choosing not to use the app” when asked about concerns people have been deleting it to avoid being “pinged”.
Hinting at a change, she added there was “work ongoing at the moment because it is entirely possible to tune the app to ensure that it is appropriate to the risk”.
A BBC analysis has estimated 4.5 million people could be asked to self-isolate between this week and 16 August, as the number of infections continues to rise.
The NHS Covid-19 app is used in England and Wales. Wales, Scotland and Northern Ireland have their own powers to set coronavirus regulations and separate test-and-trace programmes.
‘Coming to an end’
On Thursday, Chancellor Rishi Sunak acknowledged there was “frustration” at how the NHS contact tracing app could continue to order the double jabbed to isolate.
Prof Sir Jonathan Montgomery, a healthcare law expert from University College London who advised the government on the initial launch of the app, said it could still be useful but the government needed to issue new guidance.
“The real reason we shouldn’t abandon the tool is because so many transmissions of Covid happen before people realise they are unwell,” he told Times Radio.
“What the app does is enable you to be careful, and what the government needs to say is ‘what does care look like in the new world?’.”
“I rely on the NHS app, as many people do,” he said.
“I know how difficult it has been for people and I’m sorry for the hassle that people experienced as a result of this – it is coming to an end.”