INFLUENZA VIRUSES ISOLATED BY
WHO/NREVSS Collaborating Laboratories
1998 - 1999 Season
Year/Week (yyyyww) Number of Labs Reporting Total Specimens Tested A(H1N1) A(H3N2) A (subtyping not performed) B Total Isolates Percent Positive
199840 111 1407 0 2 0 0 2 0.14
199841 111 1453 0 4 1 0 5 0.34
199842 110 1654 1 0 2 0 3 0.18
199843 111 1814 0 1 0 5 6 0.33
199844 114 2051 0 12 6 0 18 0.88
199845 116 2222 0 5 5 4 14 0.63
199846 111 2051 0 4 0 4 8 0.39
199847 110 1809 0 5 4 8 17 0.94
199848 119 2397 0 11 6 11 28 1.17
199849 113 2432 0 9 15 21 45 1.85
199850 117 2428 1 12 15 14 42 1.73
199851 114 2207 0 21 35 27 83 3.76
199852 118 2706 1 47 81 31 160 5.91
199901 123 3524 0 72 183 76 331 9.39
199902 127 3889 1 151 311 111 574 14.76
199903 116 4262 1 193 518 153 865 20.30
199904 120 5210 1 222 658 269 1150 22.07
199905 122 6143 1 351 926 400 1678 27.32
199906 121 6574 2 317 1134 407 1860 28.29
199907 125 6723 9 262 1065 379 1715 25.51
199908 123 6616 1 250 1052 366 1669 25.23
199909 123 5933 1 184 868 334 1387 23.38
199910 121 4289 2 137 528 216 883 20.59
199911 118 4014 5 100 346 176 627 15.62
199912 111 3242 1 78 264 121 464 14.31
199913 107 2712 0 42 121 61 224 8.26
199914 104 2222 1 27 110 38 176 7.92
199915 100 1721 1 15 75 20 111 6.45
199916 92 1368 0 11 17 8 36 2.63
199917 87 1108 0 5 20 3 28 2.53
199918 78 982 0 3 10 4 17 1.73
199919 74 801 0 0 5 4 9 1.12
199920 64 618 0 0 6 1 7 1.13
Total 3631 30 2553 8387 3272 14242 98582 14.45

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