The SARS-CoV-2 Pseudoviral Particles are replication-deficient Maloneymurine leukemia virus (MLV) pseudotyped with the SARS-CoV-2 spike protein of the Brazil P1 variant (a.k.a. 20J/501Y.V3, VOC-202101/02) ) (GISAID sequence accession number EPI_ISL_833172).