INFLUENZA VIRUSES ISOLATED BY
WHO/NREVSS Collaborating Laboratories
2002 - 2003 Season
Year/Week (yyyyww) Number of Labs Reporting Total Specimens Tested A(H1N1) A(H3N2) A (subtyping not performed) B Total Isolates Percent Positive
200240 110 1443 0 0 0 0 0 0.00
200241 106 1517 1 0 1 1 3 0.20
200242 114 1590 0 0 0 0 0 0.00
200243 115 1774 4 0 1 1 6 0.34
200244 117 1636 0 0 3 3 6 0.37
200245 122 1988 0 2 0 3 5 0.25
200246 123 2107 0 0 6 4 10 0.47
200247 127 2091 2 0 4 16 22 1.05
200248 122 1900 1 3 5 6 15 0.79
200249 124 2414 4 3 5 28 40 1.66
200250 125 2493 8 2 14 73 97 3.89
200251 128 2910 17 3 25 146 191 6.56
200252 119 2368 17 6 18 119 160 6.76
200301 126 2632 27 8 31 82 148 5.62
200302 133 2828 50 19 46 134 249 8.80
200303 133 3108 68 11 76 202 357 11.49
200304 134 3352 105 24 142 276 547 16.32
200305 137 4166 173 53 215 413 854 20.50
200306 138 4874 279 76 332 598 1285 26.36
200307 135 4676 253 115 299 517 1184 25.32
200308 138 4416 253 126 249 368 996 22.55
200309 131 4348 275 101 233 357 966 22.22
200310 129 3633 199 87 179 214 679 18.69
200311 131 3422 175 62 174 175 586 17.12
200312 124 3435 169 77 133 124 503 14.64
200313 125 2820 90 29 91 71 281 9.96
200314 121 2352 40 32 88 41 201 8.55
200315 109 2131 24 23 47 16 110 5.16
200316 107 1777 13 20 33 23 89 5.01
200317 100 1406 9 20 18 11 58 4.13
200318 99 1222 16 16 16 20 68 5.56
200319 93 1121 6 7 5 10 28 2.50
200320 87 931 7 3 3 6 19 2.04
200321 83 872 3 5 1 7 16 1.83
200322 71 705 0 2 0 4 6 0.85
200323 72 721 3 0 2 8 13 1.80
200324 63 683 0 3 0 4 7 1.02
200325 62 551 0 1 1 2 4 0.73
200326 52 439 1 1 0 0 2 0.46
200327 68 643 0 1 0 0 1 0.16
200328 66 632 0 2 1 0 3 0.47
200329 66 697 0 4 0 0 4 0.57
200330 67 636 0 4 0 0 4 0.63
200331 69 632 0 7 0 1 8 1.27
200332 67 632 0 2 0 0 2 0.32
200333 71 761 0 2 1 0 3 0.39
200334 64 649 0 0 0 0 0 0.00
200335 66 672 0 0 0 0 0 0.00
200336 61 512 0 0 2 0 2 0.39
200337 60 604 0 1 0 0 1 0.17
200338 56 535 0 1 1 0 2 0.37
200339 46 414 0 0 0 0 0 0.00
Total 5212 2292 964 2501 4084 9841 96871 10.16

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