Non-Invasive and Low-Cost Test Uses Phone Swabs to Accurately Detect COVID-19

An accurate, non-invasive, and low-cost method of testing for COVID-19 uses samples taken from the screens of mobile phones.

In their study, a team led by UCL researchers at Diagnosis Biotech (Las Condes, Chile) analyzed swabs from smartphone screens rather than directly from people, and found that people who tested positive by the regular nasal swabbing PCRs were also positive when samples were taken from phone screens. The new method - known as Phone Screen Testing (PoST) - detected the COVID-19 virus on the phones of 81 to 100% of contagious people with a high viral load, suggesting it is as accurate as antigen lateral flow tests.


Globally active screening for COVID-19 is still a priority as new variants keep emerging and the vaccination rollout is not guaranteed in many countries. However, testing is expensive and can be physically unpleasant, both of which are significant hurdles on the road to an effective test and trace system. As PoST is an environmental test, rather than a clinical test, it is both non-invasive and less expensive that a traditional nasal swabbing PCR. This means not only is it suitable for rollout in lower-income countries, but it also removes the discomfort of current COVID-19 testing options, potentially increasing take-up of regular testing among the general population. In addition, PoST sampling takes less than a minute and does not require medical personnel, which eases mass adoption in big facilities and large-scale applications. A machine is currently under development by Diagnosis Biotech which will build on this research, safely taking a phone for PoST sampling and deliver the results directly via SMS to minimize contact.

“We immediately knew this was something special, as PoST is a method that would not only make COVID-19 mass testing much easier but could also be used to contain outbreaks of new naturally occurring and man-made viruses, to avoid future pandemics,” said Dr. Rodrigo Young (UCL Institute of Ophthalmology) who led the study.

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