Table 1. Distribution of the GII.4 NoV variants detected in China during the period 2004–2015 (n = 624)^a.

GII.4 Variant	Year												Total
	2004	2005	2006	2007	2008	2009	2010	2011	2012	2013	2014	2015
Asia_2003	3	8	1										12
Hunter_2004	1	5	1										7
Den_Haag_2006b			51	35	46	14	108	58	6	11			329
Apeldoorn_2007						1							1
New_Orleans_2009						12	10	26	1				49
Sydney_2012									65	98	33	30	226

^aBlank indicates that there is no corresponding variant in that year.