Fig. 3From: Expression of the SARS-CoV-2 receptor-binding domain by live attenuated influenza vaccine virus as a strategy for designing a bivalent vaccine against COVID-19 and influenzaExpression of RBD protein by recombinant LAIV/RBD viruses in infected MDCK cells. The cells were infected with each virus in triplicates and the concentration of RBD in cell lysates was measured 60 hpi by sandwich ELISABack to article page