 Currently the most common method of COVID-19 diagnosis is by QRTPCR 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 offered by Fanyarat Chai Bung, Jai Ratcha Puenpa, Tachanan Ngamdi, and others.