Table 2. Summary of all virus isolates screened for antivirals mutations.

Isolate source	NA subtype	No. of isolates (x)	No. of mutants (y)	% (y/x)
Avian	N1	2133	57	2.67
	N2	1737	55	3.17
	N3	314	9	2.87
	N4	73	0	0
	N5	112	7	6.25
	N6	379	2	0.53
	N7	183	0	0
	N8	409	2	0.49
	N9	150	0	0
	All	5490	132	2.40
Swine	N1	169	0	0
	N2	203	18	8.87
	N3	4	0	0
	N6	1	0	0
	N7	1	0	0
	N8	1	0	0
	All	379	18	4.75
Environ.	N1	26	0	0
	N2	67	0	0
	N3	9	1	11.11
	N6	9	0	0
	N8	10	0	0
	N9	1	0	0
	All	122	1	0.82
Ottenby	N1	39	4	10.26
	N2	77	0	0
	N3	23	1	4.35
	N5	12	1	8.33
	N6	55	6	10.91
	N8	13	0	0
	N9	11	3	27,27
	All	230	15	6.52
	Total	6221	166	2,67