A fast, low-cost method to detect COVID-19 infection from a pool of samples

New Corona test developed
Researchers Stephan Riesenberg (left) and Lukas Bokelmann (right) in the lab at the Max Planck Institute for Evolutionary Anthropology. Credit: MPI f. Evolutionary Anthropology

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. Researchers of the Max Planck Institute for Evolutionary Anthropology and the Hospital St. Georg in Leipzig, Germany, have developed improved protocols for the detection of SARS-CoV-2. The method can detect a positive sample in a pool with 25 uninfected samples in less than one hour.

Quantitative real-time polymerase chain reaction (qPCR) is the most widely used 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. 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 compared to qPCR. In 2020, it was adapted to 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.

First author Lukas Bokelmann and colleagues 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 and single infected samples can be detected in a pool among 25 uninfected samples, thus reducing the technical cost per to only about 1 Euro per individual," says 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."

The study is published in Nature Communications.


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More information: Lukas Bokelmann et al. Point-of-care bulk testing for SARS-CoV-2 by combining hybridization capture with improved colorimetric LAMP, Nature Communications, 5 March 2021, DOI: 10.1038/s41467-021-21627-0
Journal information: Nature Communications

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Citation: A fast, low-cost method to detect COVID-19 infection from a pool of samples (2021, March 5) retrieved 13 April 2021 from https://medicalxpress.com/news/2021-03-fast-low-cost-method-covid-infection.html
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