INFLUENZA VIRUSES ISOLATED BY
WHO/NREVSS Collaborating Laboratories
2003 - 2004 Season
Week A(H1N1) & A(H1N2) A(H3N2) A(Unk) B Total # Tested % Positive
40 0 2 19 1 1301 1.7
41 0 3 74 0 1562 4.9
42 0 18 130 0 1809 8.2
43 0 57 398 4 2487 18.5
44 0 103 435 0 2649 20.3
45 1 273 584 3 3463 24.9
46 0 394 908 2 4508 28.9
47 0 592 1370 8 5795 34.0
48 0 488 1743 9 6363 35.2
49 0 977 2242 31 9337 34.8
50 0 1401 2616 26 11935 33.9
51 0 1082 2466 20 11382 31.3
52 0 568 1745 16 9292 25.1
53 0 462 1195 10 8286 20.1
01 0 280 571 9 6775 12.7
02 0 168 334 7 5343 9.5
03 0 95 150 1 4186 5.9
04 0 93 70 4 4058 4.1
05 1 46 56 1 3456 3.0
06 0 24 30 4 3338 1.7
07 0 28 18 8 2890 1.9
08 0 16 8 9 2309 1.4
09 0 4 6 7 2467 0.7
10 0 2 6 6 2192 0.6
11 0 4 6 1 2077 0.5
12 0 5 3 14 1580 1.4
13 0 3 5 8 1611 1.0
14 0 0 1 6 1539 0.5
15 0 0 3 12 1371 1.1
16 0 1 11 8 1266 1.6
17 0 0 4 6 1105 0.9
18 0 0 1 4 1061 0.5
19 0 0 0 2 957 0.2
20 0 0 1 2 827 0.4

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