 Currently the most common method of COVID-19 diagnosis is by QRT-PCR which is slow and requires expensive instrumentation. Here the authors report an electrochemical biosensor based on isothermal rolling circle amplification for rapid detection of SARS-CoV-2 in clinical samples. This article was authored by Fanyarat Chai Bun, Jai Racha Puenpa, Tachanan Ngamdi, and others.