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Modeling to predict cases of hantavirus pulmonary syndrome in Chile.

Abstract：

BACKGROUND:Hantavirus pulmonary syndrome (HPS) is a life threatening disease transmitted by the rodent Oligoryzomys longicaudatus in Chile. Hantavirus outbreaks are typically small and geographically confined. Several studies have estimated risk based on spatial and temporal distribution of cases in relation to climate and environmental variables, but few have considered climatological modeling of HPS incidence for monitoring and forecasting purposes. METHODOLOGY:Monthly counts of confirmed HPS cases were obtained from the Chilean Ministry of Health for 2001-2012. There were an estimated 667 confirmed HPS cases. The data suggested a seasonal trend, which appeared to correlate with changes in climatological variables such as temperature, precipitation, and humidity. We considered several Auto Regressive Integrated Moving Average (ARIMA) time-series models and regression models with ARIMA errors with one or a combination of these climate variables as covariates. We adopted an information-theoretic approach to model ranking and selection. Data from 2001-2009 were used in fitting and data from January 2010 to December 2012 were used for one-step-ahead predictions. RESULTS:We focused on six models. In a baseline model, future HPS cases were forecasted from previous incidence; the other models included climate variables as covariates. The baseline model had a Corrected Akaike Information Criterion (AICc) of 444.98, and the top ranked model, which included precipitation, had an AICc of 437.62. Although the AICc of the top ranked model only provided a 1.65% improvement to the baseline AICc, the empirical support was 39 times stronger relative to the baseline model. CONCLUSIONS:Instead of choosing a single model, we present a set of candidate models that can be used in modeling and forecasting confirmed HPS cases in Chile. The models can be improved by using data at the regional level and easily extended to other countries with seasonal incidence of HPS.

journal_name

PLoS Negl Trop Dis

journal_title

PLoS neglected tropical diseases

authors

Nsoesie EO,Mekaru SR,Ramakrishnan N,Marathe MV,Brownstein JS

doi

10.1371/journal.pntd.0002779

subject

Has Abstract

pub_date

2014-04-24 00:00:00

pages

e2779

issue

eissn

1935-2727

issn

1935-2735

pii

PNTD-D-13-00896

journal_volume

pub_type

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Modeling to predict cases of hantavirus pulmonary syndrome in Chile.