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© Research
Publication : Proceedings. Biological sciences

Avoidable errors in the modelling of outbreaks of emerging pathogens, with special reference to Ebola

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Proceedings. Biological sciences - 07 May 2015

King AA, Domenech de Cellès M, Magpantay FM, Rohani P

Link to Pubmed [PMID] – 25833863

Proc. Biol. Sci. 2015 May;282(1806):20150347

As an emergent infectious disease outbreak unfolds, public health response is reliant on information on key epidemiological quantities, such as transmission potential and serial interval. Increasingly, transmission models fit to incidence data are used to estimate these parameters and guide policy. Some widely used modelling practices lead to potentially large errors in parameter estimates and, consequently, errors in model-based forecasts. Even more worryingly, in such situations, confidence in parameter estimates and forecasts can itself be far overestimated, leading to the potential for large errors that mask their own presence. Fortunately, straightforward and computationally inexpensive alternatives exist that avoid these problems. Here, we first use a simulation study to demonstrate potential pitfalls of the standard practice of fitting deterministic models to cumulative incidence data. Next, we demonstrate an alternative based on stochastic models fit to raw data from an early phase of 2014 West Africa Ebola virus disease outbreak. We show not only that bias is thereby reduced, but that uncertainty in estimates and forecasts is better quantified and that, critically, lack of model fit is more readily diagnosed. We conclude with a short list of principles to guide the modelling response to future infectious disease outbreaks.

https://www.ncbi.nlm.nih.gov/pubmed/25833863