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Het influenzaseizoen 2013/2014 in Nederland: lage influenza-activiteit.

Jong, J.C. de, Meijer, A., Donker, G.A., Hoek, W. van der, Lange, M.M.A. de, Rimmelzwaan, G.F., Osterhaus, A.D.M.E. Het influenzaseizoen 2013/2014 in Nederland: lage influenza-activiteit. Nederlands Tijdschrift voor Medische Microbiologie: 2014, 22(4), p. 153-161.
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In the 2013/2014 season there was little influenza in the Netherlands. In weeks 2 – 16 the incidence of influenza-like illnesses (ILI) fluctuated around the epidemic threshold, which was exceeded in weeks 4 – 8, reaching a maximum of 8,6 ILI per 10,000 inhabitants in week 7.
Type A was dominant, subtype A(H3N2) being the most prevalent. C ompared w ith t he 2 012/2013 s eason, n o antigenic drift was observed in any of the four circulating influenza viruses. The influenza vaccine used for the 2013/2014 season matched antigenically well with the A(H1N1)pdm09 virus isolates but suboptimally with the A(H3N2) and B/Yamagata/16/88 lineage virus isolates. Of the 374 viruses tested for sensitivity for antivirals, one, an A(H1N1)pdm09 virus, displayed the H275Y mutation that is associated with highly reduced inhibition by oseltamivir, which was actually demonstrated in a phenotypic assay.