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Clinical characteristics of influenza virus-induced lower respiratory infection during the 2015 to 2016 season

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  • Clinical characteristics of influenza virus-induced lower respiratory infection during the 2015 to 2016 season

    J Infect Chemother. 2018 Feb 9. pii: S1341-321X(18)30007-2. doi: 10.1016/j.jiac.2018.01.002. [Epub ahead of print]
    Clinical characteristics of influenza virus-induced lower respiratory infection during the 2015 to 2016 season.

    Uda K1, Shoji K2, Koyama-Wakai C3, Furuichi M4, Iwase N5, Fujisaki S6, Watanabe S7, Miyairi I8.
    Author information

    Abstract

    BACKGROUND:

    Influenza A(H1N1)pdm09 virus infections often manifest severe respiratory symptoms, particularly in patients with a past history of allergic disease. Most of these findings were reported during the 2009 pandemic. The purpose of this study was to detail the clinical characteristics of influenza virus-induced lower respiratory infection (LRI) during the A(H1N1)pdm09-predominant 2015-2016 season.
    METHODS:

    We retrospectively reviewed the clinical characteristics of influenza-induced LRI cases in children admitted to a tertiary children's hospital. Molecular diagnostic evaluation was performed on samples obtained from the most severe cases.
    RESULTS:

    We identified 66 patients with influenza-associated hospitalization and included 21 patients with influenza virus-induced LRI for analyses. Twelve patients (57%) were admitted to the pediatric intensive care unit, seven (33%) required mechanical ventilation, and three (14%) required extracorporeal membrane oxygenation. Plastic bronchitis (PB) was identified in six patients (29%), among whom a past medical history of asthma or food allergy were noted in all six patients. A past history of allergic disease was more common among patients with, than among those without, PB (p = 0.009). A(H1N1)pdm09 was detected from all the PB cases, and phylogenetic analyses of the hemagglutinin and neuraminidase genes demonstrated that this virus belonged to subclades 6B.1 and 6B.2. In the six PB cases, we found one patient with H275Y mutation in neuraminidase.
    CONCLUSION:

    Allergic disease was a risk factor for developing PB due to influenza A(H1N1)pdm09 infection during the 2015-16 season.
    Copyright 2018 Japanese Society of Chemotherapy and The Japanese Association for Infectious Diseases. Published by Elsevier Ltd. All rights reserved.


    KEYWORDS:

    Allergic disease; Asthma; Influenza A(H1N1)pdm09; Plastic bronchitis

    PMID: 29433792 DOI: 10.1016/j.jiac.2018.01.002
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