Fig. 6From: Humoral and T cell responses to SARS-CoV-2 reveal insights into immunity during the early pandemic period in PakistanNeutralization activity for IgG positive serum samples. Virus neutralization potential of the serum with antibodies to RBD was tested at three different serum dilutions (1:10, 1:100, 1:1000) using a PCR based microneutralization assay. Sera of COVID-19 cases (S1-10), HG (S11-20) and PP (S21-24) were tested. The percentage of inhibition is calculated based on the amplification of SARS-CoV-2 RNA present by RT-PCR (Ct) compared with a control specimen (0%) in each caseBack to article page