TABLE 1.

Summary of antibody responses against different HAs by HA ELISA in cats and dogs

Species	Cohort	HA	No. of samples		Prevalencea	95% CIb
			Total	Positive
Human IAVs
Cat	Pre-2009	H12009	68	2	0.029	0.002–0.107
	2016 and 2019	H12009	253	37	0.146	0.108–0.195
	Pre-2009, 2016, and 2019	H3N2	321	5	0.016	0.006–0.037
Dog	Pre-2009	H12009	68	0	0.000	0.000–0.064
	2019	H12009	154	19	0.123	0.080–0.185
	Pre-2009 and 2019	H3N2	222	0	0.000	0.000–0.021
Avian IAVs
Cat	Pre-2009, 2016, and 2019	H5N8, H7N9, and H9N2	321	25	0.078	0.053–0.113
Dog	Pre-2009 and 2019	H5N8, H7N9, and H9N2	222	5	0.023	0.008–0.053

^aPrevalence = positive number/total sample number.

^b95% CI, 95% confidence interval (computed by the modified Wald method).