- New test that uses a saliva swab uses lasers to instantly detect coronavirus.
- Researchers from the Catalan Institute of Nanoscience and Nanotechnology in Spain say the non-invasive test is able to detect COVID-19 in humans as soon as it is present in the body.
- Hope is that the test is cheap and simple enough to use that it can be widely deployed for GPs or nurses to test patients.
A saliva test that instantly detects coronavirus with lasers could be available within a year, scientists say.
Researchers are developing a laser sensor that can pick up the disease at the earliest point of infection from a saliva or nasal swab in minutes.
They say the non-invasive optical biosensor demonstrator will pick up COVID-19 in humans as soon as it is present in the body.
Having already created six working laboratory demonstrators for other applications, the research team says the technology still needs further adaptation and testing but could be available in a year at the latest.
It was originally developed to look for bacterial infections or cancer biomarkers, the detector uses photonics – technology that manipulates light – to identify infections in patients with a small amount of the virus.
Researchers say the real-time diagnosis with high specificity from a low concentration sample, the sensor is much more reliable than the coronavirus rapid-test, “finger-prick” kit which detects if a person has had the coronavirus before and has since recovered.
Researchers say a laser sensor can pick up the disease from a saliva or nasal swab in minutes © Ben Birchall/PA
Calling themselves CONVAT and co-ordinated at ICN2 – the Catalan Institute of Nanoscience and Nanotechnology, Spain – the researchers have tested the demonstrators on patients’ samples provided by hospitals in Spain.
Project co-ordinator, Professor Laura Lechuga said: “With thousands of deaths worldwide, we are in urgent need of a rapid new testing kit that is accurate, highly sensitive, non-invasive and cheap to produce.
“We are currently integrating all the instrumentation in a portable 25x15x25 cm box with a tablet control.
“At present, our detector is user-friendly, with the preparation being only technical expertise required, and could be widely deployed for GPs or nurses to test patients.
“Our nanosensor is capable of detecting RNA strands which will fully identify the new coronavirus.”
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Chairman of the Photonics21 Healthcare Workgroup, Dr Jurgen Popp, said: “The CONVAT team are working round the clock to develop a rapid, non-invasive test for coronaviruses.
“The ability to spot this terrible virus quickly will contribute to the worldwide effort in fighting 2019-nCoV and highlights yet another success for photonics and light technologies.”
Funded by Horizon 2020, the European Commission’s scientific research initiative, the scientists started work on their detector at the start of March, in response to the pandemic.
Can I get the coronavirus from a parcel?
A US study found that the coronavirus can survive for up to 24 hours on cardboard (and paper is likely to be similar). So for the parcel to be contaminated, someone with COVID-19 would have had to touch or cough on your parcel within the past day.
The chances of this are low, but common sense advice would be to wash your hands with soap and water after opening the parcel, and then again after you’ve disposed of the packaging – especially if you or anyone else in your household is in one of the vulnerable groups.
The same study found that the virus can survive for up to three days on hard, shiny surfaces such as plastic and stainless steel – which is why door handles are particularly good vectors for the virus. So, if you receive anything packaged in plastic, such as takeaway deliveries, make sure to wash your hands after touching it, and especially before eating.
We don’t yet know how long the virus can survive on smartphone screens, but it’s likely to be up to three days. This means that you should ideally clean your phone with disinfectant wipes (Apple recommends 70 per cent isopropyl alcohol wipes), at least once a day.