Table 1.

Prevalence of NS1 truncation in the C-terminal end in 16 hemagglutinin subtypes of avian influenza viruses from 1902 to 2015.

Subtype	202	207	212	214	216	217	219	220	224	225	227	228	229	230	237	238	Total ΔNS1 CTE***	Total NS1 sequences	%
H1						1	14							567			15	582	2.6
H2						1								425			1	426	0.2
H3						2	14	1						1416			17	1433	1.2
H4	3						2					1		1315	5		6	1326	0.5
H5*	1					42	3	1					1	725	87		48	860	5.6
H5N1**			3			8		13				76		2056	18	1	100	2175	4,6
H6	1		1			453					1			918			456	1374	33.2
H7	1			1	2	476	2	32	84					969	1		598	1568	38.1
H8														138			0	138	0
H9						998	2	5		6		3		512			1014	1526	66.4
H10		1				69								729			70	799	8.8
H11						1	5							502			6	508	1.2
H12														159			0	159	0
H13														94	1		0	95	0
H14														16			0	16	0
H15														11			0	11	0
H16														30			0	30	0
Total ΔNS1 CTE	6	1	4	1	2	2051	42	52	84	6	1	80	1	10582	112	1	2331	13026	17.9
%	0.3	0.01	0.2	0.01	0.1	88.0	1.8	2.2	3.6	0.3	0.01	3.4	0.01	81.2	0.9	0.01

^*including H5N1 until 1999

^**H5N1 from 2000

^***sum of truncated forms only (202–229)