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PREPRINT: Using digital epidemiology methods to monitor influenza-like illness in the Netherlands in real-time: the 2017-2018 season

View ORCID ProfilePP Schneider, CJAW van Gool, P Spreeuwenberg, M Hooiveld, GA Donker, DJ Barnett, J Paget
doi: https://doi.org/10.1101/440867
PP Schneider
1Faculty of Health, Medicine and Life Sciences, Maastricht University
2Nivel (Netherlands Institute of Health Service Research)
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  • ORCID record for PP Schneider
CJAW van Gool
3School CAPHRI, Maastricht University
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P Spreeuwenberg
2Nivel (Netherlands Institute of Health Service Research)
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M Hooiveld
2Nivel (Netherlands Institute of Health Service Research)
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GA Donker
2Nivel (Netherlands Institute of Health Service Research)
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DJ Barnett
1Faculty of Health, Medicine and Life Sciences, Maastricht University
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J Paget
2Nivel (Netherlands Institute of Health Service Research)
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Abstract

Introduction Despite the early development of Google Flu Trends in 2009, digital epidemiology methods have not been adopted widely, with most research focusing on the USA. In this article we demonstrate the prediction of real-time trends in influenza-like illness (ILI) in the Netherlands using search engine query data.

Methods We used flu-related search query data from Google Trends in combination with traditional surveillance data from 40 general sentinel practices to build our predictive models. We introduced an artificial 4-week delay in the use of GP data in the models, in order to test the predictive performance of the search engine data.

Simulating the weekly use of a prediction model across the 2017/2018 flu season we used lasso regression to fit 52 prediction models (one for each week) for weekly ILI incidence. We used rolling forecast cross-validation for lambda optimization in each model, minimizing the maximum absolute error.

Results The models accurately predicted the number of ILI cases during the 2017/18 ILI epidemic in real time with a mean absolute error of 1.40 (per 10,000 population) and a maximum absolute error of 6.36. The model would also have identified the onset, peak, and end of the epidemic with reasonable accuracy

The number of predictors that were retained in the prediction models was small, ranging from 3 to 5, with a single keyword (‘Griep’ = ‘Flu’) having by far the most weight in all models.

Discussion This study demonstrates the feasibility of accurate real-time ILI incidence predictions in the Netherlands using internet search query data. Digital ILI monitoring strategies may be useful in countries with poor surveillance systems, or for monitoring emergent diseases, including influenza pandemics. We hope that this transparent and accessible case study inspires and supports further developments in field of digital epidemiology in Europe and beyond.

Footnotes

  • Contact: project.flutrend{at}gmail.com

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY 4.0 International license.
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Posted October 11, 2018.
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PREPRINT: Using digital epidemiology methods to monitor influenza-like illness in the Netherlands in real-time: the 2017-2018 season
PP Schneider, CJAW van Gool, P Spreeuwenberg, M Hooiveld, GA Donker, DJ Barnett, J Paget
bioRxiv 440867; doi: https://doi.org/10.1101/440867
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PREPRINT: Using digital epidemiology methods to monitor influenza-like illness in the Netherlands in real-time: the 2017-2018 season
PP Schneider, CJAW van Gool, P Spreeuwenberg, M Hooiveld, GA Donker, DJ Barnett, J Paget
bioRxiv 440867; doi: https://doi.org/10.1101/440867

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