Outbreak of Human Metapneumovirus in a Nursing Home: A Clinical Perspective

Damien Seynaeve, Brigitte Augusseau-Rivière, Pascal Couturier, Christine Morel-Baccard, Caroline Landelle, Jean-Luc Bosson, Gaëtan Gavazzi, Marie-Reine Mallaret, Damien Seynaeve, Brigitte Augusseau-Rivière, Pascal Couturier, Christine Morel-Baccard, Caroline Landelle, Jean-Luc Bosson, Gaëtan Gavazzi, Marie-Reine Mallaret

Abstract

Objectives: To describe a human metapneumovirus (hMPV) outbreak occurring in a nursing home for older adults and to identify the risk factors associated with the clinical infection.

Design: A retrospective, case-controlled study.

Setting and participants: A French nursing home for older adults between December 27, 2014 and January 20, 2015. Probable cases were residents presenting at least 1 respiratory symptom or 1 constitutional symptom. Confirmed cases identified in the same way as probable cases but with a positive RT-PCR test for hMPV. Controls were residents with no symptoms of respiratory infection.

Measures: Identification of hMPV was realized on nasal swab samples by RT-PCR.

Results: Seventy-eight older people were resident at the time of the outbreak. Three of the 4 tested were positive for hMPV by RT-PCR and negative for 13 other viruses or bacteria. All probable infected residents presented cough; other symptoms were scarcer. An inflammatory response was present, with median C-reactive protein at 50 mg/L. The median duration of the illness was 7 days. The rate of infection among residents was high (51%), with 5 hospitalizations (12.5%) and 1 death (2.5%). In multivariate analysis, vaccination against influenza virus appeared to emerge as associated with a probable hMPV infection, but this might be an artifact, as the proportion of unvaccinated residents was low (15%). A clear infected population profile was hard to define, although limited autonomy and low ADL score may play a role. Basic hygiene precautions were reinforced, but droplet precautions seemed difficult to apply rigorously to this population.

Conclusions/implications: Clinical and biological presentations were nonspecific. The rate of infection was high, highlighting the need for the rapid introduction of strict precautions to contain the infection.

Keywords: Outbreak; metapneumovirus; nursing home; prevention.

Copyright © 2019 AMDA – The Society for Post-Acute and Long-Term Care Medicine. Published by Elsevier Inc. All rights reserved.

Figures

Fig. 1
Fig. 1
Epidemic chart. The dates of the onset of symptoms are reported on the x-axis, each unit of time corresponds to 1 day, and each case is represented by a rectangle.

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Source: PubMed

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