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Representative images of infected or mock Vero cells, with the PRNT-SARS-CoV-2 procedure optimized. (A) Cell monolayer with 2 × 105 Vero cell/well (CC: cell control), resulting in regular-sized plaques (VC: virus control) and a good resolution. (B) Representative image of positive (PC) and negative (NC) controls of Vero cells infected with approximately 60 PFU of SARS-CoV-2.
