Ten influenza seasons in France: distribution and timing of influenza A and B circulation, 2003–2013

摘要: Describing the circulation of influenza viruses and characteristics seasonal epidemics remains an essential tool to optimize strategies prevention control. Special attention has been recently paid B in context availability a quadrivalent vaccine, containing two strains. We used data from practitioners-based surveillance network describe France 2003–2004 2012–2013. Nasopharyngeal swabs taken acute respiratory infection (ARI) patients between October April were tested for influenza. reported number cases by virus type (A, B), subtype (A(H1), A(H3)) lineage (Yamagata, Victoria) each season determined frequency vaccine mismatch. estimated weekly incidence extrapolating French population. compared temporal caused A(H1), A(H3) B. Overall, 49,919 ARI tested, which 16,287 (32.6 %) positive Type 23.7 % all cases. Virus subtypes A(H1) 51.6 % 48.4 % A cases, respectively. Viruses B-Yamagata B-Victoria 62.8 % 37.2 % There was mismatch three five seasons where 10 % or more Influenza had highest average value during study period. peaked 3.8 weeks later than when both types circulating. No differences duration observed. most prevalent around one fourth tended circulate A. The mismatches substantial. Timely on collected within systems are control strategies.