TMPRSS2 and infection: At 48 hours post-infection, we detected robust co-staining of SARS-CoV-2 N positive and human IgG patches (reminiscent of CB6) on Vero E6 cells (Fig 6E, top); effect of CB6 on SARS-CoV-2 syncytia formation was further enhanced when SARS-CoV-2 infected Vero E6 cells over-expressing the TMPRSS2 (Fig 6E, bottom).