Figure 1.
ELISA of cat serum samples against the recombinant receptor binding domain (RBD) of SARS-CoV-2 spike protein. The dashed line is the cut-off. Each dot represents one individual sample within each antigen panel. Before, serum samples collected between Mar. and May, 2019 prior to COVID-19 outbreak; After, serum samples collected between Jan to Mar., 2020 after COVID-19 outbreak; FIPV- I, hyperimmune sera against type I feline infectious peritonitis virus (FIPV); FIPV-II, hyperimmune sera against type II FIPV.
