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 2992 1.1
41 0 0 9 0 2 8 3059 0.62
42 0 2 9 0 8 8 3213 0.84
43 0 0 12 0 19 12 3457 1.24
44 0 1 17 0 11 9 3792 1
45 0 2 14 0 17 15 3984 1.2
46 0 1 14 0 16 14 4221 1.07
47 0 2 21 0 28 19 3757 1.86
48 0 1 33 0 21 17 4268 1.69
49 0 5 38 0 29 17 4496 1.98
50 0 3 77 0 29 19 4669 2.74
51 0 7 105 0 54 23 4691 4.03
52 0 4 104 0 43 16 4988 3.35
01 0 16 105 0 37 19 5230 3.38
02 0 30 139 0 43 17 5100 4.49
03 0 47 196 0 50 17 5061 6.13
04 0 77 256 0 95 28 5569 8.19
05 0 121 364 0 123 40 5543 11.69
06 0 157 417 0 159 53 5853 13.43
07 0 210 500 0 243 66 6537 15.59
08 0 296 680 0 325 69 6886 19.9
09 0 428 941 0 388 102 7701 24.14
10 0 472 1117 0 437 103 7599 28.02
11 0 546 1309 0 459 179 7864 31.7
12 0 419 1017 0 372 223 7284 27.88
13 0 322 687 0 283 221 6560 23.06
14 0 266 571 0 258 231 5549 23.9
15 0 173 469 0 144 238 4953 20.67
16 0 70 270 1 129 160 2952 21.34

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