IJSR International Journal of Scientific Research 2277 - 8179 Indian Society for Health and Advanced Research ijsr-10-7-36134 Original Research Paper Evaluation of performance of nine serological assays for the detection of SARS-COV-2 antibodies. Mohamed Rida Dr. EL KOCHRI Safae Dr. ABI Rachid Dr. ENNIBI Khalid Dr. July 2021 10 7 01 02