Table 2.

Prevalence of avian influenza virus in different types of samples from field survey

Types	Sum	Prevalence (%)
		A	H5	H7	H9	H5/H7/H9
Poultry samples	16 10	21 (1.30)	0 (0)	0 (0)	0 (0)	0 (0)
Feces	16 10	21 (1.30)	0 (0)	0 (0)	0 (0)	0 (0)
Environment samples	1561	31 (1.99)	0 (0)	0 (0)	4 (0.26)	4 (0.26)
Cage swabs	585	7 (1.20)	0 (0)	0 (0)	3 (0.51)	3 (0.51)
Drinking water samples	519	9 (1.73)	0 (0)	0 (0)	0 (0)	0 (0)
Sewage samples	82	0 (0)	0 (0)	0 (0)	0 (0)	0 (0)
Crib swabs	294	13 (4.42)	0 (0)	0 (0)	0 (0)	0 (0)
Environmental surface swabs	81	2 (2.47)	0 (0)	0 (0)	1 (1.23)	1 (1.23)
Total	3171	52 (1.64)	0 (0)	0 (0)	4 (0.13)	4 (0.13)
χ2	–	2.2825	–	–	–	–
P-value	–	0.1308	–	–	–	–