Fig. 2.

FACS analysis for cross reactive binding antibodies between SARS-CoV-2 and HIV-1: A). The FACS-based cell surface antibody staining assay with HIV-1 efficiently cleaved, functional Envs 4-2. J41 (clade C), JRFL and JRCSF (clades B) with mice spike hyperimmune sera. A representative histogram showing binding of spike immunized mice polyclonal sera to cell surface expressed HIV-1 protein. (B) GMFI data for the binding of HIV cell surface expressed Env to mice SARS-CoV-2 serum samples. All the experiments were done in duplicate and repeated at least two times. Statistical significance between Pre-immune and different treated groups is shown as ****P < 0.0001.