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 3405 0.82
43 0 0 12 0 19 12 3652 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 4441 1.04
47 0 2 23 0 29 19 4006 1.82
48 0 2 32 0 22 17 4573 1.6
49 0 5 38 0 43 20 4597 2.31
50 0 4 78 0 28 19 4778 2.7
51 0 7 104 0 57 24 4854 3.96
52 0 4 105 0 47 17 5148 3.36
01 0 16 105 0 38 21 5333 3.38
02 0 30 139 0 44 16 5130 4.46
03 0 48 196 0 50 17 5126 6.07
04 0 80 256 0 96 30 5645 8.18
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 0 327 73 6953 19.85
09 0 434 959 0 388 103 7786 24.2
10 0 483 1147 0 444 105 7690 28.34
11 0 557 1320 0 469 178 7983 31.62
12 0 423 1032 0 376 220 7295 28.12
13 0 306 693 0 286 231 6763 22.42
14 0 262 611 0 268 255 5988 23.31
15 0 187 561 0 174 282 5603 21.49
16 0 118 516 0 171 306 5201 21.36
17 0 72 347 0 126 264 4287 18.87
18 0 52 277 0 94 224 3810 16.98
19 0 34 218 0 71 224 3131 17.47
20 0 21 88 0 41 136 2054 13.92

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