Low-Cost and Fast COVID-19 Test Detects SARS-CoV-2 from Pool of Gargle Lavage Samples in One Hour

By LabMedica International staff writers
Posted on 08 Mar 2021

Researchers have developed a low-cost and fast method to detect COVID-19 infection from a pool of gargle lavage samples.

Researchers of the Max Planck Institute for Evolutionary Anthropology (Leipzig, Germany) have developed improved protocols for the detection of SARS-CoV-2, and the method can detect a positive sample in a pool with 25 uninfected samples in less than one hour. In order to monitor and contain the spread of SARS-CoV-2, it is necessary to test large numbers of people on a regular basis in decentralized settings. Quantitative real-time polymerase chain reaction (qPCR) is the most widely used diagnostic method to detect RNA viruses such as SARS-CoV-2. However, it requires expensive laboratory equipment and global shortages of reagents for RNA purification has increased the need to find simple but reliable alternatives.

Image: Researchers Stephan Riesenberg (left) and Lukas Bokelmann (right) in the lab at the St. Georg Hospital Leipzig (Photo courtesy of MPI f. Evolutionary Anthropology)

One alternative to the qPCR technology is RT-LAMP (reverse transcription loop-mediated isothermal amplification). This test amplifies the desired target sequences of the virus at a constant temperature, using minimal equipment as compared to qPCR. In 2020, RT-LAMP was adapted for the detection of SARS-CoV-2. It was also shown that instead of a swab, which many people find unpleasant, it can be performed on gargle lavage samples.

Max Planck researchers have now developed an improved colorimetric RT-LAMP assay, called Cap-iLAMP (capture and improved loop-mediated isothermal amplification), which extracts and concentrates viral RNA from a pool of gargle lavage samples. After a short incubation, the test result - orange/red for negative, bright yellow for positive - can be interpreted visually or by using a freely available smartphone app. The improved testing method outperforms previous similar methods.

“Cap-iLAMP drastically reduces false positives and single infected samples can be detected in a pool among 25 uninfected samples, thus reducing the technical cost per test to only about 1 Euro per individual”, said senior author Stephan Riesenberg, a researcher at the Max Planck Institute for Evolutionary Anthropology. “Our method overcomes problems associated with standard RT-LAMP and could also be applied to numerous other pathogens.”

Related Links:
Max Planck Institute for Evolutionary Anthropology