A new influenza surveillance system in F
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W. Dab; P. Quenel; J. M. Cohen; C. Hannoun
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Article
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1991
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Springer
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English
โ 718 KB
The evaluation of the validity of the GROG's indicators is based on the first five years of activity, four of which being epidemic ones. A virological criterion for identifying epidemics is used as the gold standard. For each non-specific indicator, the ratio of epidemic weeks to non-epidemic weeks