Table. Overview of longitudinal samples used in study of SARS-CoV-2 seroprevalence and immunity in cats, United Kingdom, April 2020–February 2022*.

Sample	Days between sampling	Titer				% Decrease per day
		B.1	Alpha	Delta		B.1	Alpha	Delta
Cat F	12	490	257	601		5.90	0.90	4.10
		146	229	303
Cat G	175	586	677	243		0.40	0.40	0.40
		134	170	58
Cat H	94	687	825	2,165		0.30	0.20	0.70
		474	678	685
Cat J	175	627	719	247		0.30	0.40	0.40
		318	241	79
Cat L	23	109	102	468		−7.20	1.40	1.60
		289	70	301

*We used 2 samples from each of 5 animals, taken >12 d apart. The earlier sample was used in the overall analysis; however, newer samples were also tested. Values related to each variant are shown for each sample, with the earlier sample above and later below. Titers are color-coded by size (stronger titers and greater decreases are shown with darker shading). B.1 indicates ancestral/wild-type virus.