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Influenzaseizoen 2017/2018 in Nederland.

Fouchier, R., Meijer, A., Donker, G.A., Hoek, W. van der, Lange, M. de, Koopmans, M. Influenzaseizoen 2017/2018 in Nederland. Nederlands Tijdschrift voor Medische Microbiologie: 2019, 25(1), p. 53-64.
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The influenza epidemic of 2017/2018 started in week 50 of 2017 and lasted 18 weeks. The epidemic had a peak incidence in week 10 of 2018 of 17 persons with influenza-like illness (ILI) per 10.000 inhabitants and ILI incidence near this maximum from weak 4 until week 9.

Influenza B-viruses of the Yamagata lineage were responsible for most influenza activity in a season with an influenza B-virus of the Victoria lineage included in the vaccine. Influenza A-viruses were detected with increasing frequency towards the end of the season.

The A(H1N1)pdm09-viruses belonged to clade 6b.1 and displayed good antigenic similarity to the vaccine strain. The A(H3N2)-viruses mostly belonged to clades 3C.2a2 and 3C.2a1b, for which the antigenic similarity to the vaccine strain was fair to good.

Influenza Bviruses of the Victoria lineage that were antigenically divergent from the vaccine due to a deletion in the emagglutinin gene were detected sporadically. Noteworthy was the detection of a seasonal reassortant A(H1N2) virus in a single patient.