Figure 1. Percent inhibition against SARS-COV-2 receptor binding-domain (RBD) in serum of domestic cats whose owners had a history of COVID-19 (n = 41).

C: controls, (−): negative, (+): positive. The 17.1% and 29.3% shows the frequency of cats with neutralizing antibodies with 30% and 20% of cut-off values of inhibition, respectively.