INFLUENZA VIRUSES ISOLATED BY
WHO/NREVSS Collaborating Laboratories
2011 - 2012 Season
Week A(H1) A(2009 H1N1) A(H3) H3N2v A(unable to sub-type) A(Subtyping not performed) B Total # Tested % Positive
40 0 3 14 0 0 7 9 3197 1.03
41 0 0 9 0 0 2 8 3319 0.57
42 0 2 10 0 0 8 8 3433 0.82
43 0 0 12 0 0 19 12 3707 1.16
44 0 1 17 0 0 11 9 4038 0.94
45 0 2 15 0 0 17 15 4255 1.15
46 0 0 15 0 0 17 11 4503 0.95
47 0 3 23 0 0 29 20 4071 1.84
48 0 2 32 0 0 22 17 4635 1.57
49 0 5 38 0 0 43 20 4668 2.27
50 0 4 78 0 0 28 19 4859 2.65
51 0 7 104 0 0 57 24 4981 3.85
52 0 4 107 0 0 47 17 5331 3.28
01 0 16 101 0 0 38 22 5558 3.18
02 0 31 138 0 0 45 15 5276 4.34
03 0 50 195 0 0 50 17 5259 5.93
04 0 84 256 0 0 96 30 5775 8.07
05 0 124 365 0 0 128 41 5862 11.22
06 0 164 418 0 0 159 55 6110 13.03
07 0 220 506 0 0 255 69 6837 15.36
08 0 295 689 0 0 326 75 7109 19.48
09 0 443 986 0 0 392 107 8029 24.01
10 0 494 1220 0 0 451 116 7978 28.59
11 0 574 1392 0 0 482 198 8295 31.9
12 0 436 1086 0 0 403 238 7599 28.46
13 0 306 717 0 0 299 239 7038 22.18
14 0 266 627 0 0 282 270 6251 23.12
15 0 187 592 0 0 186 290 5919 21.2
16 0 123 548 0 0 173 312 5451 21.21
17 0 83 365 0 0 133 269 4650 18.28
18 0 64 310 0 0 99 247 4193 17.17
19 0 39 232 0 0 76 266 3778 16.23
20 0 34 167 0 0 57 252 3564 14.31
21 0 18 88 0 0 63 253 3470 12.16
22 0 16 85 0 0 46 224 3015 12.31
23 0 16 48 0 0 40 200 2986 10.18
24 0 9 63 0 0 52 179 2724 11.12
25 0 3 38 0 0 26 105 2343 7.34
26 0 3 26 0 0 22 117 2116 7.94
27 0 5 16 0 0 13 57 1817 5.01
28 0 4 36 1 0 15 43 1908 5.19
29 0 0 18 0 0 11 47 1933 3.93
30 0 2 49 9 0 10 31 1927 5.24
31 0 1 65 95 0 4 35 1939 10.31
32 0 3 63 73 0 8 26 2118 8.17
33 0 6 69 52 0 9 28 2236 7.33
34 0 7 48 15 0 14 25 2392 4.56
35 0 1 36 12 0 12 26 2444 3.56
36 0 1 34 5 0 11 36 2598 3.35
37 0 0 19 2 0 9 48 2909 2.68
38 0 4 34 0 0 18 40 3123 3.07
39 0 3 17 0 0 20 49 2476 3.59

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