Volume 36, Issue 22
Research Article

Probabilistic forecasting in infectious disease epidemiology: the 13th Armitage lecture

Leonhard Held

Corresponding Author

E-mail address: leonhard.held@uzh.ch

Epidemiology, Biostatistics and Prevention Institute, University of Zurich, Zurich, 8001 Switzerland

Correspondence to: Leonhard Held, Epidemiology, Biostatistics and Prevention Institute, University of Zurich, Hirschengraben 84, 8001 Zurich, Switzerland.

E‐mail: leonhard.held@uzh.ch

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Sebastian Meyer

Epidemiology, Biostatistics and Prevention Institute, University of Zurich, Zurich, 8001 Switzerland

Institute of Medical Informatics, Biometry, and Epidemiology, Friedrich‐Alexander‐Universität Erlangen‐Nürnberg, Erlangen, 91054 Germany

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Johannes Bracher

Epidemiology, Biostatistics and Prevention Institute, University of Zurich, Zurich, 8001 Switzerland

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First published: 27 June 2017
Citations: 24

Abstract

Routine surveillance of notifiable infectious diseases gives rise to daily or weekly counts of reported cases stratified by region and age group. From a public health perspective, forecasts of infectious disease spread are of central importance. We argue that such forecasts need to properly incorporate the attached uncertainty, so they should be probabilistic in nature. However, forecasts also need to take into account temporal dependencies inherent to communicable diseases, spatial dynamics through human travel and social contact patterns between age groups. We describe a multivariate time series model for weekly surveillance counts on norovirus gastroenteritis from the 12 city districts of Berlin, in six age groups, from week 2011/27 to week 2015/26. The following year (2015/27 to 2016/26) is used to assess the quality of the predictions. Probabilistic forecasts of the total number of cases can be derived through Monte Carlo simulation, but first and second moments are also available analytically. Final size forecasts as well as multivariate forecasts of the total number of cases by age group, by district and by week are compared across different models of varying complexity. This leads to a more general discussion of issues regarding modelling, prediction and evaluation of public health surveillance data. Copyright © 2017 John Wiley & Sons, Ltd.

Number of times cited according to CrossRef: 24

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