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INFLUENZA VIRUSES ISOLATED BY
WHO/NREVSS Collaborating Laboratories
2011 - 2012 Season

Week	A(H1)	A(2009 H1N1)	A(H3)	A(unable to sub-type)	A(Subtyping not performed)	B	Total # Tested	% Positive
40	0	3	14	0	7	9	3147	1.05
41	0	0	9	0	2	8	3269	0.58
42	0	2	10	0	8	8	3404	0.82
43	0	0	12	0	19	12	3651	1.18
44	0	1	17	0	11	9	3991	0.95
45	0	2	15	0	17	15	4198	1.17
46	0	1	15	0	16	14	4438	1.04
47	0	3	23	0	29	20	4010	1.87
48	0	2	32	0	22	17	4573	1.6
49	0	5	38	0	43	20	4598	2.31
50	0	4	78	0	28	19	4778	2.7
51	0	7	104	0	57	24	4853	3.96
52	0	4	105	0	47	17	5148	3.36
01	0	16	105	0	38	21	5344	3.37
02	0	30	139	0	45	16	5157	4.46
03	0	49	196	0	50	17	5140	6.07
04	0	82	256	0	94	30	5655	8.17
05	0	124	364	0	125	41	5700	11.47
06	0	163	419	0	154	54	5943	13.29
07	0	218	505	0	247	67	6684	15.51
08	0	295	686	0	329	73	6956	19.88
09	0	435	958	0	388	103	7787	24.19
10	0	485	1147	0	442	105	7692	28.33
11	0	560	1320	0	466	179	7986	31.62
12	0	427	1032	0	376	219	7297	28.15
13	0	306	696	0	286	231	6767	22.45
14	0	262	614	0	268	257	6028	23.24
15	0	187	569	0	174	282	5695	21.28
16	0	119	524	0	171	308	5278	21.26
17	0	72	353	0	128	265	4486	18.23
18	0	52	288	0	96	232	4052	16.49
19	0	44	238	0	76	255	3685	16.64
20	0	32	162	0	55	230	3363	14.24
21	0	23	76	0	61	223	3210	11.93
22	0	14	79	0	45	194	2661	12.48
23	0	12	19	0	32	141	2105	9.69