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ELISA of dog serum samples against the recombinant receptor‐binding domain (RBD) of SARS‐CoV‐2 spike protein. The dashed line indicates the cut‐off. Each dot represents one individual sample within each antigen panel. Before: serum samples collected between June and December 2019 prior to COVID‐19 outbreak. After: serum samples collected between January to September 2020 after COVID‐19 outbreak
