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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	3268	0.58
42	0	2	10	0	8	8	3405	0.82
43	0	0	12	0	19	12	3651	1.18
44	0	1	17	0	11	9	3990	0.95
45	0	2	15	0	17	15	4197	1.17
46	0	1	15	0	16	14	4406	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	4779	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	48	196	0	51	17	5140	6.07
04	0	80	256	0	96	30	5654	8.17
05	0	122	364	0	127	41	5699	11.48
06	0	161	419	0	156	54	5942	13.3
07	0	216	505	0	250	67	6685	15.53
08	0	294	686	0	330	73	6956	19.88
09	0	434	958	0	390	103	7788	24.2
10	0	483	1147	0	444	105	7690	28.34
11	0	557	1320	0	469	178	7987	31.6
12	0	427	1032	0	376	220	7299	28.15
13	0	306	695	0	286	231	6767	22.43
14	0	262	614	0	268	256	6027	23.23
15	0	187	569	0	174	283	5697	21.29
16	0	119	523	0	171	308	5277	21.24
17	0	72	352	0	126	265	4435	18.38
18	0	52	287	0	96	231	4050	16.44
19	0	44	238	0	76	253	3623	16.86
20	0	32	161	0	54	226	3258	14.52
21	0	22	72	0	58	210	2926	12.37
22	0	12	44	0	39	142	1802	13.15