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A new era for accurate, rapid COVID-19 testing

Novel technique to detect different coronavirus variants quickly, including fast-spreading strains present in human saliva

October 26, 2023
Osaka University
Researchers demonstrate a nanopore-based technique that can detect different variants of SARS-CoV-2, the virus that causes COVID-19. The method was very effective in detecting the Omicron variant of the virus in the saliva of people with COVID-19.

A rapid, accurate way of testing for COVID-19 infection would be a big step in overcoming the virus' hold over our society. Now, in an article published in Lab on a Chip, Japanese researchers have developed a promising solution: a novel platform that couples nanopore technology with artificial intelligence.

What is a nanopore? A nanopore is a miniscule hole in a thin substrate, often a silicon wafer. A nanopore might range from several nanometers to several hundred nanometers in diameter -- a scale small enough to work with SARS-CoV-2, the virus that causes COVID-19.

Kaoru Murakami, the study's lead author, explains: "Our technology involves looking at changes in the electrical current as different materials are passed through tiny nanopores. With the use of artificial intelligence, we can understand the structure, volume, and surface charge of different materials, including viruses."

SARS-CoV-2 is typical of many other RNA viruses in that it constantly mutates, thereby changing the properties of the virus -- including infection rates and symptoms. One infamous mutation of the virus, the Omicron variant, was first identified in November 2021 and is known for its ability to spread quickly. One of the greatest challenges for COVID-19 testing so far has been accurately determining the presence or absence of newly mutated variants in a sample.

Thus, the researchers first sought to demonstrate that their platform could detect differences between six different variants of SARS-CoV-2. Next, they investigated whether their platform could identify SARS-CoV-2 strains in 241 saliva samples, collected from 132 people infected with SARS-CoV-2 and 109 uninfected people.

Not only was the platform able to distinguish between SARS-CoV-2 variants, but it was also able to determine the presence of the Omicron variant 100% of the time.

The researchers hypothesize that their AI-driven platform is detecting differences in the so-called spike proteins (also called S-proteins) that coat the surface of coronaviruses. These proteins, which tend to mutate very quickly, bind to host cell receptors and play a crucial role in penetrating host cells.

Until now, the gold standard for SARS-CoV-2 detection has been a method called RT-PCR (the reverse transcription-polymerase chain reaction test).

"Like RT-PCR, our AI-nanopore platform can detect coronavirus with high sensitivity and specificity. However, a major advantage of our nanopore system is that it is much less expensive and has the potential to measure a larger number of samples in a given period of time," explains Masaaki Murakami, senior author.

The benefits of this system are not specific to SARS-CoV-2; other RNA viruses also tend to have high mutation rates, and so this platform could be used to detect viruses such as influenza. The new platform could even be rapidly adapted to test for the next newly emerged infectious disease.

Story Source:

Materials provided by Osaka University. Note: Content may be edited for style and length.

Journal Reference:

  1. Kaoru Murakami, Shimpei I. Kubota, Kumiko Tanaka, Hiroki Tanaka, Keiichiroh Akabane, Rigel Suzuki, Yuta Shinohara, Hiroyasu Takei, Shigeru Hashimoto, Yuki Tanaka, Shintaro Hojyo, Osamu Sakamoto, Norihiko Naono, Takayui Takaai, Kazuki Sato, Yuichi Kojima, Toshiyuki Harada, Takeshi Hattori, Satoshi Fuke, Isao Yokota, Satoshi Konno, Takashi Washio, Takasuke Fukuhara, Takanori Teshima, Masateru Taniguchi, Masaaki Murakami. High-precision rapid testing of omicron SARS-CoV-2 variants in clinical samples using AI-nanopore. Lab on a Chip, 2023; DOI: 10.1039/D3LC00572K

Cite This Page:

Osaka University. "A new era for accurate, rapid COVID-19 testing." ScienceDaily. ScienceDaily, 26 October 2023. <>.
Osaka University. (2023, October 26). A new era for accurate, rapid COVID-19 testing. ScienceDaily. Retrieved May 21, 2024 from
Osaka University. "A new era for accurate, rapid COVID-19 testing." ScienceDaily. (accessed May 21, 2024).

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