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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	3139	1.05
41	0	0	9	0	2	8	3274	0.58
42	0	2	10	0	8	8	3402	0.82
43	0	0	12	0	19	12	3652	1.18
44	0	1	17	0	11	9	3993	0.95
45	0	2	15	0	17	15	4201	1.17
46	0	1	15	0	16	14	4443	1.04
47	0	3	23	0	29	20	4011	1.87
48	0	2	32	0	22	17	4572	1.6
49	0	5	38	0	43	20	4600	2.3
50	0	4	78	0	28	19	4775	2.7
51	0	7	104	0	57	24	4872	3.94
52	0	4	105	0	47	17	5194	3.33
01	0	16	105	0	38	21	5426	3.32
02	0	30	139	0	45	16	5204	4.42
03	0	49	196	0	50	17	5193	6.01
04	0	82	256	0	94	30	5692	8.12
05	0	124	364	0	125	41	5752	11.37
06	0	163	419	0	155	54	6008	13.17
07	0	218	505	0	248	67	6735	15.41
08	0	295	686	0	326	73	7002	19.71
09	0	435	958	0	386	103	7847	23.98
10	0	485	1147	0	445	106	7724	28.26
11	0	560	1320	0	466	183	8016	31.55
12	0	427	1032	0	383	219	7342	28.07
13	0	306	696	0	290	235	6810	22.42
14	0	262	614	0	270	260	6081	23.12
15	0	187	569	0	174	283	5741	21.13
16	0	119	524	0	171	310	5307	21.18
17	0	72	354	0	128	268	4513	18.21
18	0	52	289	0	96	236	4109	16.38
19	0	44	239	0	76	261	3724	16.65
20	0	33	163	0	56	245	3438	14.46
21	0	23	77	0	61	245	3299	12.31
22	0	14	91	0	45	211	2753	13.11
23	0	13	39	0	34	175	2500	10.44
24	0	10	17	0	42	130	1897	10.49