Table 2. Prevalence of avian influenza subtypes in different sample types.

Types	Sum	Positive samples (%)
		A	H5	H7	H9	H5/H7/H9
Fecal dropping swabs	1225	541 (44.2)	80 (6.5)	159 (13.0)	309 (25.2)	395 (32.2)
Poultry cage swabs	615	321 (52.2)	36 (5.9)	111 (18.0)	190 (30.9)	237 (38.5)
Drinking water samples	224	164 (73.2)	39 (16.5)	46 (20.5)	89 (39.7)	114 (50.9)
Sewage samples	310	187 (60.3)	51 (16.5)	64 (20.6)	94 (30.3)	145 (46.8)
Chopping board swabs	406	255 (62.8)	59 (14.5)	90 (22.2)	145 (35.7)	200 (49.3)
Others	85	51 (60.0)	4 (4.7)	27 (31.8)	39 (45.9)	47 (55.3)
x2		99.333	64.692	39.351	185.095	71.116
P		<0.001	<0.001	<0.001	<0.001	<0.001
Total	2865	1519 (53.0)	267 (9.3)	497 (17.3)	866 (30.2)	1138 (39.7)