INFLUENZA VIRUSES ISOLATED BY
WHO/NREVSS Collaborating Laboratories
1997 - 1998 Season
Year/Week (yyyyww) Number of Labs Reporting Total Specimens Tested A(H1N1) A(H3N2) A (subtyping not performed) B Total Isolates Percent Positive
199740 118 1291 0 0 0 0 0 0.00
199741 119 1513 0 0 11 0 11 0.73
199742 119 1552 0 3 13 1 17 1.10
199743 121 1669 0 0 7 0 7 0.42
199744 119 1897 0 9 1 0 10 0.53
199745 121 2106 0 0 6 0 6 0.28
199746 123 2204 0 3 4 1 8 0.36
199747 123 2533 0 5 17 1 23 0.91
199748 120 2242 0 14 22 1 37 1.65
199749 124 2607 0 11 28 1 40 1.53
199750 121 3086 0 37 59 2 98 3.18
199751 123 3410 0 84 159 0 243 7.13
199752 132 3349 0 111 311 0 422 12.60
199753 127 4402 1 161 627 1 790 17.95
199801 127 5294 0 211 808 3 1022 19.30
199802 127 5501 3 281 863 4 1151 20.92
199803 129 6196 1 453 1132 1 1587 25.61
199804 129 6730 0 589 1299 1 1889 28.07
199805 126 6288 0 413 1266 1 1680 26.72
199806 125 5867 1 363 1061 5 1430 24.37
199807 125 4904 0 226 757 4 987 20.13
199808 127 3975 0 93 469 4 566 14.24
199809 122 3169 0 63 241 3 307 9.69
199810 120 2658 0 47 149 6 202 7.60
199811 123 2234 0 30 86 5 121 5.42
199812 118 2048 0 12 66 6 84 4.10
199813 111 1683 0 11 29 7 47 2.79
199814 113 1532 0 6 22 6 34 2.22
199815 109 1357 0 0 27 12 39 2.87
199816 111 1421 0 1 16 4 21 1.48
199817 108 1236 0 1 9 6 16 1.29
199818 105 1142 0 3 8 5 16 1.40
199819 101 1038 0 0 5 4 9 0.87
199820 98 938 0 0 2 7 9 0.96
Total 4064 6 3241 9580 102 12929 99072 13.05

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