Table 1.

Hemagglutination inhibition seroprevalence for the different strains of influenza A across locations

HI strains	HI seroprevalence % (number of sera)
	Collective slaughterhouse (N = 964)	Local slaughterhouses (N = 677)	Market (N = 609)	Overall (N = 2250)
H3N2/415	3.4 (33)	1.5 (10)	0 (0)	1.9 (43)
H3N2/601	10.1 (97)	23.6 (160)	1.1 (7)	11.7 (264)
H1N1/pdm	14.2 (137)	23.2 (157)	1.6 (10)	13.5 (304)
H1N2/826	10.9 (105)	13.1 (89)	0 (0)	8.6 (194)
H1N1/EA	2.8 (27)	1.6 (11)	0 (0)	1.7 (38)
Total HI positive	29.1 (281)	48.7 (330)	2.8 (17)	27.9 (628)

All HI test results were included regardless of titer differences between strains of same subtype