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 3148 1.05
41 0 0 9 0 2 8 3103 0.61
42 0 2 9 0 8 8 3246 0.83
43 0 0 12 0 19 12 3496 1.23
44 0 1 17 0 11 9 3835 0.99
45 0 2 14 0 17 15 4034 1.19
46 0 1 14 0 16 14 4266 1.05
47 0 2 22 0 29 19 3817 1.89
48 0 1 32 0 23 17 4345 1.68
49 0 5 38 0 43 20 4598 2.31
50 0 3 78 0 29 19 4774 2.7
51 0 7 104 0 57 24 4852 3.96
52 0 4 105 0 47 17 5145 3.36
01 0 16 104 0 38 21 5328 3.36
02 0 30 139 0 44 16 5128 4.47
03 0 47 196 0 51 17 5120 6.07
04 0 78 256 0 98 30 5640 8.19
05 0 121 364 0 128 41 5698 11.48
06 0 157 419 0 160 54 5941 13.3
07 0 215 505 0 251 67 6684 15.53
08 0 291 686 0 330 73 6954 19.84
09 0 431 958 0 391 103 7785 24.19
10 0 475 1147 0 452 105 7689 28.34
11 0 550 1320 0 476 178 7982 31.62
12 0 420 1032 0 379 220 7294 28.12
13 0 304 693 0 288 231 6761 22.42
14 0 262 610 0 268 255 5936 23.5
15 0 186 560 0 162 282 5502 21.63
16 0 116 509 0 161 304 5167 21.1
17 0 70 301 0 117 258 4084 18.27
18 0 45 198 0 46 163 2889 15.65
19 0 12 79 0 61 136 2171 13.27

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