INFLUENZA VIRUSES ISOLATED BY
WHO/NREVSS Collaborating Laboratories
2003 - 2004 Season
Year/Week (yyyyww) Number of Labs Reporting Total Specimens Tested A(H1N1) A(H3N2) A (subtyping not performed) B Total Isolates Percent Positive
200340 109 1430 0 2 19 1 22 1.54
200341 120 1682 0 3 74 0 77 4.58
200342 118 2176 0 17 235 1 253 11.63
200343 124 2568 0 56 398 4 458 17.83
200344 125 2753 0 100 435 0 535 19.43
200345 134 3553 1 273 585 3 862 24.26
200346 136 4595 0 381 908 2 1291 28.10
200347 146 5942 0 585 1375 8 1968 33.12
200348 147 6479 0 489 1752 10 2251 34.74
200349 156 9598 0 977 2260 32 3269 34.06
200350 154 12422 0 1401 2660 29 4090 32.93
200351 149 11783 0 1084 2525 20 3629 30.80
200352 147 9748 0 569 1826 16 2411 24.73
200353 138 8461 0 463 1226 12 1701 20.10
200401 138 6936 0 280 573 9 862 12.43
200402 137 5411 0 169 331 5 505 9.33
200403 126 4329 0 96 161 3 260 6.01
200404 125 4166 0 93 70 3 166 3.98
200405 121 3661 1 46 58 2 107 2.92
200406 116 3530 0 24 36 5 65 1.84
200407 117 3136 0 29 19 8 56 1.79
200408 112 2559 0 16 10 12 38 1.48
200409 111 2651 0 4 6 8 18 0.68
200410 109 2369 0 2 6 6 14 0.59
200411 109 2239 0 4 7 2 13 0.58
200412 110 1801 0 5 4 15 24 1.33
200413 105 1850 0 3 5 9 17 0.92
200414 102 1778 0 0 1 8 9 0.51
200415 96 1564 0 0 3 12 15 0.96
200416 103 1449 0 2 11 11 24 1.66
200417 93 1377 0 0 4 7 11 0.80
200418 97 1298 0 0 3 6 9 0.69
200419 89 1241 0 0 0 2 2 0.16
200420 80 1105 0 0 1 3 4 0.36
200421 81 1055 0 1 2 3 6 0.57
200422 79 823 0 0 2 4 6 0.73
200423 73 793 0 0 1 2 3 0.38
200424 77 844 0 0 0 2 2 0.24
200425 82 741 0 1 1 1 3 0.40
200426 72 730 0 1 0 2 3 0.41
200427 70 573 0 0 0 1 1 0.17
200428 68 746 0 0 0 2 2 0.27
200429 67 563 0 0 0 2 2 0.36
200430 73 671 0 0 0 0 0 0.00
200431 76 628 0 1 0 1 2 0.32
200432 74 620 0 1 0 0 1 0.16
200433 73 647 0 0 0 1 1 0.15
200434 75 823 0 0 3 1 4 0.49
200435 77 827 0 4 0 0 4 0.48
200436 78 822 0 0 0 3 3 0.36
200437 77 907 0 1 4 2 7 0.77
200438 77 890 0 2 1 1 4 0.45
200439 80 919 0 4 8 2 14 1.52
Total 5528 2 7189 17609 304 25104 152262 16.49

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