Table. Norovirus GII.4 variants that emerged and led to gastroenteritis epidemics in Victoria, Australia, 2002–15^a.

Norovirus GII.4 variant	Month and year of first detection	First epidemic peakb	Delayc in months
Farmington_Hills_2002	July 2002	September–November 2002	2
Hunter_2004	February 2004	August–October 2004	6
Yerseke_2006a	December 2005	May–July 2006	5
Den Haag_2006b	June 2006	October–December 2006	4
NewOrleans_2009	January 2009	August–October 2009	7
Sydney_2012	May 2012	October–December 2012	5

^a This table makes use of sequencing information from previous studies in our laboratory [11,14] as well as inclusion of novel data.

^b An epidemic ‘peak’ was considered to be three consecutive months of the highest number of norovirus gastroenteritis outbreaks in a calendar year, except in 2006 where there were two epidemic peaks of similar size [14].

^c Time delay from first detection to the beginning of the first epidemic peak.