Table 7.

Cross-reactivity of SARS-CoV-2-positive cat serum samples and SARS-CoV-2 RBD-specific monoclonal antibodies with FeCoV.

Serum ID	IFA		VN		IFA		VN
	(FeCoV)		(FeCoV)		(SARS-CoV-2)		(SARS-CoV-2)
#026 (21 DPC)	>1:40	Pos	<1:4	Neg	1:5,120	Pos	1:40	Pos
#328 (4 DP2C)	>1:320	Pos	<1:4	Neg	>1:5,120	Pos	1:160	Pos
#272 (4 DP2C)	>1:320	Pos	<1:4	Neg	>1:5,120	Pos	1:80	Pos
#903 (4 DP2C)	>1:320	Pos	<1:4	Neg	>1:5,120	Pos	1:160	Pos
mAb 91C2	<1:5	Neg	<1:4	Neg	1:1,280	Pos	1:32	Pos
mAb 91G12	<1:5	Neg	<1:4	Neg	1:2,560	Pos	1:64	Pos
mAb 117C1	<1:5	Neg	<1:4	Neg	1:640	Pos	1:256	Pos
mAb 117E2	<1:5	Neg	<1:4	Neg	1:2,560	Pos	1:64	Pos

FeCoV, feline coronavirus; mAb, monoclonal antibody; DPC, days post-challenge; 4 DP2C, four days post-second challenge.