Contact tracing is nothing new.
It is used here in Northern Ireland to deal with outbreaks of a variety of conditions, even for the likes of sexually transmitted infections, and it is one of the interventions that have been used to effectively control Ebola virus disease outbreaks in Africa.
Hopes are high that it will help keep a lid on the number of Covid-19 infections, allowing children to return to class - and, if numbers of cases drop low enough, even help those who are shielding to return to some kind of normality.
According to the latest figures, Northern Ireland has gone two days without any Covid-19 fatalities, while it was announced yesterday that just six people had tested positive in the previous 24 hours.
It is an incredible achievement, and attentions are now focusing on how to safely move beyond the coronavirus pandemic. Contact tracing will play a key role in this.
Northern Ireland's contact tracing team is based in the Public Health Agency's (PHA) headquarters in Linenhall Street in Belfast city centre.
In recent weeks, the team has grown from a handful of people to 82. They come from a number of backgrounds, including PHA nurses, Regulation and Quality Improvement Authority inspectors and environmental health officers.
There are a further 20 people taking part in the training, which takes a day-and-a-half to complete. The number of people required to work at any one time will vary depending on requirements and the programme is being designed to respond quickly to needs.
With just six positive cases in the past 24 hours, demand is obviously significantly lower than what would have been required during the peak of the surge. However, social distancing measures are being eased and everyone is expecting the number of cases to rise as a result.
With that, it is expected that more people will be required in the team, although the PHA estimates at least 20 staff will be required to work in shifts as access to testing is increased and the number of positive cases goes up.
Of course, testing is a key component of the contact tracing programme, which is why it is essential that anyone with a new and continuous cough, fever or new loss of taste and smell makes an appointment for a test.
Dr Sarah Milligan, a public health registrar at the PHA, explained: "Anyone experiencing these symptoms can book a test by going onto the PHA website.
"Tests are done at one of the drive-through testing centres or they can be done at home, and tests are available the same day or the next day depending on how many people are looking for a test on that day.
"When a person tests positive, the contact tracing centre is made aware of that and a contact tracer will make contact with the person.
"During that phone call, we will give infection control advice on how to minimise spread of the virus through the household. Just because someone has Covid-19, it doesn't necessarily follow that everyone they live with will get it as well. That's why it's so important that people wash their hands regularly, that they socially distance and they don't touch their faces.
"If a person tests positive, they should isolate for seven days from the onset of their symptoms, as long as their fever has gone. So, if they still have a cough or their sense of taste and smell is still affected, they can stop isolating.
"Everyone in their household must isolate for 14 days, regardless of whether they are displaying symptoms when we contact them. But if they begin to experience symptoms, they can stop isolating after seven days of the onset of their symptoms - again, as long as they no longer have a fever.
"It's really important that anyone in the household isolates for the full 14 days if they don't have symptoms. If anyone else in the house has symptoms, they, too, should arrange to be tested.
"The contact tracer will also ask about close contacts the positive case has had in the 48 hours before they developed symptoms up to seven days afterwards and will risk-assess all those contacts.
"They will ask if they have been in contact less than two metres for more than 15 minutes, or if they have had face-to-face conversation at a shorter distance. They will want to know if they were coughing near anyone or if they had direct skin-to-skin contact.
"They then get the contact details of anyone they feel may be at risk from the positive case and make contact with them to tell them to isolate. That's all done as soon as possible after the person first tests positive."
So far, from May 19 up until last Saturday, the contact tracing team has dealt with 480 telephone cases.
There have been 721 successful telephone calls with contacts of confirmed cases.
Of course, the programme itself has some limitations. As lockdown lifts, our contact with strangers will increase and, as Dr Milligan explains, it will be impossible to trace all contacts from the likes of public transport, and it will also rely heavily on cooperation from the public following isolation advice.
The fact is, however, as desperate as we all are to get our lives back on track, that can only happen when Covid-19 is brought under control.