TABLE 1.

Virus segment identities

Gene	Strain	Segment identity (%)a
		H1N1-NC	H1N2-NC	H1N1-MN	H3N2-NC
PB2	H1N1-NC	100
	H1N2-NC	97	100		97
	H1N1-MN	96	97	100	97
	H3N2-NC	98			100
PB1	H1N1-NC	100
	H1N2-NC	46	100		98
	H3N2-NC	46			100
PA	H1N1-NC	100
	H1N2-NC	93	100		93
	H3N2-NC	99			100
HA	H1N1-NC	100
	H1N2-NC	78	100		52
	H1N1-MN	93	76	100	51
	H3N2-NC	56			100
NP	H1N1-NC	100
	H1N2-NC	94	100		93
	H1N1-MN	25	25	100	25
	H3N2-NC	97			100
NA	H1N1-NC	100
	H1N2-NC	94	100		93
	H1N1-MN	25	25	100	25
	H3N2-NC	97			100
M1	H1N1-NC	100
	H1N2-NC	98	100		98
	H1N1-MN	24	24	100	24
	H3N2-NC	99			100
NS1/NS2	H1N1-NC	100
	H1N2-NC	98	100		97
	H1N1-MN	26	27	100	26
	H3N2-NC	98			100

^aPercent identities between each segment among the SIV used in the study were calculated using SIAS (74).