Table 1.

Combinations of the segments in swine strains.

Year	District	ID*	Types of the segments
			PB2	PB1	PA	HA	NP	NA	MP	NEP
1998	US**	1068961	M	M	M	H3	M	N2	U	M
1930	US	380342	R	nd	R	M/R	M/R	U/R	U/R	M/R
1988	US	380341	R	R	R	M	M	U	U	M
1991	US	441597	R	R	R	M	M	U	U	M
2005	US	590637	M	M	M	R	M	R	U	M
2007	US	556272	M	M	M	M	M	U	U	M
2005	US***	398800	M	(R)	M	R	M	R	U	M
2011	US	1166417	M	M	M	M	M	M	M	M
2012	US	1449545	M	M	M	M	M	U	M	M
2011	Mexico	1820554	M	M	M	M	M	M	M	M
2012	Mexico	1820566	R	M	M	M	M	M	M	M
2014	Mexico	1820589	M	M	M	M	M	M	M	M
1985	France	624775	U	U	U	U	U	M	M	U
1992	England	382847	U	U	U	U	U	M	M	U
1993	England	624781	U	U	U	U	U	M	M	U
1993	Denmark	624780	U	U	U	U	U	M	M	U
1998	England	624787	U	U	U	U	U	M	M	U
2003	Spain**	374441	U	U	U	U	U	M	M	U
2005	England	1654110	U	U	U	R	U	N2	M	U
2005	Germany	456883	U	U	U	R	U	N2	M	U
2005	England	1176041	U	U	U	U	U	M	M	U
2010	Switzerland****	940568	U	U	U	U	U	M	M	U
2011	France	1654182	U	U	U	U	U	M	M	U
2012	Netherlands	1654269	U	U	U	U	U	M	M	U
2003	Thailand	519832	U	U	U	M	U	M	M	U
2005	Thailand	488885	U	U	U	M	U	M	M	U
1981	Japan	387253	R	R	R	M	M	U	U	M
2004	China	452465	M	R	R	R	R	R	R	R
2006	China	452464	R	R	R	R	R	R	R	R
2007	China	649625	U	U	U	U	U	M	M	U
2007	China**	568225	M	M	M	M	M	N2	U	M
2012	China	1511996	U	U	U	U	U	M	M	U

*NCBI taxonomy ID.

**Triple reassortant.

***Triple reassortant H1N1, human.

****Detected from human sample.

PB: polymerase basic protein, PA: polymerase acidic protein, HA: hemagglutinin, NP: nucleoprotein, NA: neuraminidase, MP: matrix proteins, NEP: non-structural proteins. R and M are those found in the pandemic 1977 Russia and 2009 Mexico human viruses. U is virtually unfound in humans.