Browsing by Author "Mordecai E.A."

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    A systematic review of the data, methods and environmental covariates used to map Aedes-borne arbovirus transmission risk
    (2023-12-01) Lim A.Y.; Jafari Y.; Caldwell J.M.; Clapham H.E.; Gaythorpe K.A.M.; Hussain-Alkhateeb L.; Johansson M.A.; Kraemer M.U.G.; Maude R.J.; McCormack C.P.; Messina J.P.; Mordecai E.A.; Rabe I.B.; Reiner R.C.; Ryan S.J.; Salje H.; Semenza J.C.; Rojas D.P.; Brady O.J.; Mahidol University
    Background: Aedes (Stegomyia)-borne diseases are an expanding global threat, but gaps in surveillance make comprehensive and comparable risk assessments challenging. Geostatistical models combine data from multiple locations and use links with environmental and socioeconomic factors to make predictive risk maps. Here we systematically review past approaches to map risk for different Aedes-borne arboviruses from local to global scales, identifying differences and similarities in the data types, covariates, and modelling approaches used. Methods: We searched on-line databases for predictive risk mapping studies for dengue, Zika, chikungunya, and yellow fever with no geographical or date restrictions. We included studies that needed to parameterise or fit their model to real-world epidemiological data and make predictions to new spatial locations of some measure of population-level risk of viral transmission (e.g. incidence, occurrence, suitability, etc.). Results: We found a growing number of arbovirus risk mapping studies across all endemic regions and arboviral diseases, with a total of 176 papers published 2002–2022 with the largest increases shortly following major epidemics. Three dominant use cases emerged: (i) global maps to identify limits of transmission, estimate burden and assess impacts of future global change, (ii) regional models used to predict the spread of major epidemics between countries and (iii) national and sub-national models that use local datasets to better understand transmission dynamics to improve outbreak detection and response. Temperature and rainfall were the most popular choice of covariates (included in 50% and 40% of studies respectively) but variables such as human mobility are increasingly being included. Surprisingly, few studies (22%, 31/144) robustly tested combinations of covariates from different domains (e.g. climatic, sociodemographic, ecological, etc.) and only 49% of studies assessed predictive performance via out-of-sample validation procedures. Conclusions: Here we show that approaches to map risk for different arboviruses have diversified in response to changing use cases, epidemiology and data availability. We identify key differences in mapping approaches between different arboviral diseases, discuss future research needs and outline specific recommendations for future arbovirus mapping.
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    Why the growth of arboviral diseases necessitates a new generation of global risk maps and future projections
    (2025-04-01) Brady O.J.; Bastos L.S.; Caldwell J.M.; Cauchemez S.; Clapham H.E.; Dorigatti I.; Gaythorpe K.A.M.; Hu W.; Hussain-Alkhateeb L.; Johansson M.A.; Lim A.; Lopez V.K.; Maude R.J.; Messina J.P.; Mordecai E.A.; Peterson A.T.; Rodriquez-Barraquer I.; Rabe I.B.; Rojas D.P.; Ryan S.J.; Salje H.; Semenza J.C.; Tran Q.M.; Brady O.J.; Mahidol University
    Global risk maps are an important tool for assessing the global threat of mosquito and tick-transmitted arboviral diseases. Public health officials increasingly rely on risk maps to understand the drivers of transmission, forecast spread, identify gaps in surveillance, estimate disease burden, and target and evaluate the impact of interventions. Here, we describe how current approaches to mapping arboviral diseases have become unnecessarily siloed, ignoring the strengths and weaknesses of different data types and methods. This places limits on data and model output comparability, uncertainty estimation and generalisation that limit the answers they can provide to some of the most pressing questions in arbovirus control. We argue for a new generation of risk mapping models that jointly infer risk from multiple data types. We outline how this can be achieved conceptually and show how this new framework creates opportunities to better integrate epidemiological understanding and uncertainty quantification. We advocate for more co-development of risk maps among modellers and end-users to better enable risk maps to inform public health decisions. Prospective validation of risk maps for specific applications can inform further targeted data collection and subsequent model refinement in an iterative manner. If the expanding use of arbovirus risk maps for control is to continue, methods must develop and adapt to changing questions, interventions and data availability.