TABLE 1.

Passive and active sample collection and A (H5) detection from September 2012 to August 2015

Period of collection	Sourcea	Total no. of samples	Total no. of H5-positive samples	% of positive samples	No. of provinces
September to December 2012	Market-based surveillance	2,546	125	4.91	21
	Outbreak	109	56	51.38	15
2013	Market-based surveillance	4,904	336	6.85	44
	Outbreak	123	83	67.48	20
2014	Market-based surveillance	8,926	655	7.34	30
	Outbreak	311	84	27.01	33
January to August 2015	Market-based surveillance	2,029	73	3.60	14
	Outbreak	123	36	29.27	13
Total	Market-based surveillance	18,405	1,189	6.46	50
	Outbreak	666	259	38.89	46

^aMarket-based surveillance, active surveillance through monthly sampling in live-bird markets; outbreak, passive surveillance in response to poultry outbreak.