Contact tracing: how will the UK’s test, track and trace plan help ease lockdown

The Prime Minister Boris Johnson has announced a new Covid Alert System set-up, to be developed by a new Joint Biosecurity Centre.

The Covid Alert Level will work on a scale of one to five – a measurement system to be used in conjunction with track and trace measures such as the new NHS contact tracing app.

An NHS version of a contact tracing app has been trialed on the Isle of Wight this week after the Telegraph revealed the plans in April, but just 40 per cent of the population of the island have downloaded the app so far.

The contact tracing app has been billed as a key to easing social distancing measures, helping to pinpoint those who need to be in quarantine and alert people who have been in “significant contact” with those who have tested positive.

It is expected to be fully rolled out across the UK later this month. However, it has emerged that the NHS has tasked a private company to “investigate” if it can switch its contact-tracing app over to the global standard proposed by Apple and Google amid concerns over glitches and incompatibility – just days after the UK’s version launched in a regional trial on the Isle of Wight.

Countries around the world are rushing to launch contact tracing apps to identify who an infected person has had contact with, as part of efforts to slow the spread of the coronavirus

From teams of “corona detectives”, to Army cadets making thousands of calls a day, here are some of the ways countries are tracing the spread of Covid-19. 

What is contact tracing?

Contact tracing is a method of preventing the spread of a disease. Health workers interview people who have been diagnosed with coronavirus and work out who they might have recently been in contact with.

They put together a timeline and network of contacts, telling other people who might have been exposed to the infected person to quarantine themselves.

The Government’s test, track and trace regime will be in place by the ‘start of June’, Michael Gove has pledged, as he said over 17,000 contact tracers have now been recruited.

What are the UK’s plans?

The UK has launched the new Covid Alert Level system, which will signify different levels of risk posed by the virus as the outbreak continues.

The new threat scale will keep the public informed about the level of threat that the virus poses, with England currently at Level Four but expected to gradually move to Level Three.

Level Three signifies that the number of new infections is not increasing significantly, and that the ‘R number’ – reproduction rate – of the virus is below one. This will still entail lockdown measures, but with considerable relaxations of the current restrictions which have constituted the Government’s response tothe virus.

Prime Minister Boris Johnson said on Sunday: “We must have a world-beating system for testing potential victims, and for tracing their contacts.”

Contact tracing will be rolled out on a national basis from later this month through the use of the ‘NHSX’ contact tracing app, which notifies people who have been in “significant contact” with those who have tested positive for the disease.

It works by using Bluetooth signals to detect when two phones come close to each other, and anyone who becomes unwell with coronavirus symptoms can notify the app, which then informs other users.

What has the first contact tracing trial looked like?

The UK’s contact tracing app went live from Tuesday for NHS staff on the Isle of Wight.

From Thursday, all of the 80,000 households on the island will get a letter from the chief nurse with comprehensive information about the trial, and asking them to install the app. 

Mr Hancock said: “If you’re watching this and you live on the Isle of Wight, I have a simple message: please, download the app to protect the NHS and save lives.

“By downloading the app you are protecting your own health, the health of your loved ones, and the health of your community.”

But Professor Christophe Fraser, leading the Oxford University team developing it, has warned that 60 per cent of Britons will need to download it for it to be successful.

Fears have been raised by MPs about the potential take-up of the scheme, with David Davis citing “security concerns” over the storage of data.

The former Brexit secretary told the Telegraph: “A lot of people don’t like the idea of being tracked. The more intrusive the app is, the smaller the take-up will be.”

The Isle of Wight

Just 40 per cent of people on the Isle of Wight have to date downloaded the app, according to Robert Jenrick, the Secretary of State for Housing, Communities and Local Government. Mr Jenrick said that 50,000 people have downloaded it in a week, representing less than half of the island’s population.

Professor Christophe Fraser, who is leading the Oxford University team responsible for its development, warned that 60 per cent of Britons must download and use the app if it is to be effective.

The NHS contact tracing app has also been hit by a number of glitches, including reports from residents that it did not work on phones which are four years old or more.

There have also been concerns that the app drains the battery levels on people’s phones, with some users saying that they would delete the software if this were to continue.

Bob Seely, MP for the island, said on Thursday that the trial was off to a “strong start”, and that 33,000 people on the island had downloaded the app in its first day.

The Transport Secretary Grant Shapps said on Saturday that the trial was “going well”, saying that islanders had been downloading it “enthusiastically”, while Mark Waldron – the headmaster at the independent Ryde School on the island – told the Telegraph that there had been no noticeable impact on the battery life or performance of his phone.


In Europe, governments want to use Bluetooth ‘handshakes’ between devices as a way to measure the risk of infection, but approaches differ as to whether such contacts should be logged on devices or on a central server.

Under Germany’s contact tracing policy, every person who has come into contact with an infected patient in the last two weeks is tracked down and tested.

Although the number of national tracers is unknown, in one region, near the Dutch border, officials rang those isolating twice a day to check their symptoms and their temperatures, according to the Rheinische Post, a local newspaper.

Germany has also chosen a home-grown smartphone app, developed for the Robert Koch Institute, to trace infections.

The government told lawmakers it has backed the centralised platform developed by the Pan-European Privacy-Preserving Proximity Tracing (PEPP-PT) consortium and an app built by one of its members, the Fraunhofer Heinrich Hertz Institute.

The move puts it at odds with Apple, which has refused on privacy grounds to support the necessary short-range communication on iPhones.


Irish public servants are making more than 2,000 calls a day to monitor and trace the spread of the coronavirus.

The contacts of every confirmed case in the country have been contacted, officials have said, and before lockdown this involved calling around 40 people per person.

Earlier this month, officials said 2,000 calls were being made a day from nine tracing centres across the country – this is set to be increased to 5,000 calls per day.

The team comprises 200 tracers, but 1,700 have received training in how to make the calls and could be utilised if the outbreak continues, The Irish Times reports.

Tracers include Defence Force Cadets and more than 60,000 personal contacts have been made so far.


Belgium will hire 2,000 “corona detectives” to trace the contacts of individuals with Covid-19.

The team of tracers will be distributed regionally, with 200 in Brussels, 600 in Wallonia and 1,200 in Flanders, according to the national newspaper, De Tijd.

Those identified by the contact tracers will then be tested, if they test positive for Covid-19 they will be quarantined for two weeks.

Federal authorities are also working on developing an app to locate potential coronavirus infections. A legal framework is being designed for the app and regional authorities would choose which developer they wish to work with.

United States

The United States currently has 2,200 disease investigation specialists, known as contact tracers, according to a report by the Association of State and Territorial Health Officials (ASTHO).

But it would need at least an additional 100,000 to trace possible infections, ASTHO estimated.

Contact tracing is currently being conducted at a state level, despite Robert Redfield, head of the US Centers for Disease Control and Prevention, stating “it is going to be critical”.

Mike Bloomberg, the former mayor of New York City, will help build an “army” of coronavirus tracers to test, trace and then isolate residents with the virus in the tri-state area; New York, New Jersey and Connecticut. New York state currently has 500 tracers.

San Francisco has also launched a pilot program linking a tech company with 250 tracers, while Massachusetts has said it will hire around 1,000.


In France mobile teams will be used to trace the contacts of those infected with the coronavirus, French health authorities have said.

But they did not specify how many contact tracers the country currently has.

France aims to be able to test 700,000 people per week for the virus and begin lifting restrictions on May 11.

People infected with the virus will be put into quarantine at home or in specific facilities like hotels.

Later this month, lawmakers will vote on the government’s plan to launch a contact tracing app to fight the coronavirus outbreak. The planned smartphone app would warn users if they come into contact with anyone infected with the coronavirus.

South Korea

In South Korea, where daily new case totals have mostly been lower than the previous day since the end of February, authorities have rigorously traced an individual’s movements after testing positive.

They have done this through interviews, GPS phone tracking, credit-card records, and surveillance camera footage.

Once potential virus carriers are identified they are also tested.

Anonymised data showing Covid-19 patient’s movements is also published online, allowing others to identify if they may have come into contact with an infected individual.

The effective contact tracing system, known as the Covid-19 Smart Management System, is run by the country’s Centers for Disease Control and Prevention (KCDC) and can analyse a person’s movements in just 10 minutes.


In Singapore, the government has said that it is able to trace between 2,000 and 4,000 contacts of Covid-19 patients each day, as members of the police and army phone people who may have come into contact with a confirmed case.

The country also launched the app TraceTogether on March 20 to track the contacts of those who have been infected with the coronavirus.

It claims to have around 1.1 million users, around one fifth of the country’s population, and uses Bluetooth technology.

The app logs unique codes over Bluetooth signals between nearby phones which have the app installed, the data is then used to identify contacts when one user tests positive for the virus.