A label-free electrochemical DNA biosensor used a printed circuit board gold electrode (PCBGE) to detect SARS-CoV-2 without amplification Nor Syafirah Zambry, Mohd Syafiq Awang, Khi Khim Beh, Hairul H Hamzah, Yazmin Bustami, Godwin Attah Obande, Muhammad Fazli Khalid, Mehmet Ozsoz , Asrulnizam Abd Manaf and Ismail Aziah Abstract The emergence of coronavirus disease 2019 (COVID-19) motivates continuous efforts to develop robust and accurate diagnostic tests to detect the severe acute...