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Predictive indicators for Ross River virus infection in the Darwin area of tropical northern Australia, using long-term mosquito trapping data

To describe the epidemiology of Ross River virus (RRV) infection in the endemic Darwin region of tropical northern Australia and to develop a predictive model for RRV infections. Analysis of laboratory confirmed cases of RRV infection between 01 January 1991 and 30 June 2006, together with climate,...

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Published in:Tropical medicine & international health 2008-07, Vol.13 (7), p.943-952
Main Authors: Jacups, Susan P, Whelan, Peter I, Markey, Peter G, Cleland, Sam J, Williamson, Grant J, Currie, Bart J
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description To describe the epidemiology of Ross River virus (RRV) infection in the endemic Darwin region of tropical northern Australia and to develop a predictive model for RRV infections. Analysis of laboratory confirmed cases of RRV infection between 01 January 1991 and 30 June 2006, together with climate, tidal and mosquito data collected weekly over the study period from 11 trap sites around Darwin. The epidemiology was described, correlations with various lag times were performed, followed by Poisson modelling to determine the best main effects model to predict RRV infection. Ross River virus infection was reported equally in males and females in 1256 people over the 15.5 years. Average annual incidence was 113/100 000 people. Infections peaked in the 30-34 age-group for both sexes. Correlations revealed strong associations between monthly RRV infections and climatic variables and also each of the four implicated mosquito species populations. Three models were created to identify the best predictors of RRV infections for the Darwin area. The climate-only model included total rainfall, average daily minimum temperature and maximum tide. This model explained 44.3% deviance. Using vector-only variables, the best fit was obtained with average monthly trap numbers of Culex annulirostris, Aedes phaecasiatus, Aedes notoscriptus and Aedes vigilax. This model explained 59.5% deviance. The best global model included rainfall, minimum temperature and three mosquito species. This model explained 63.5% deviance, and predicted disease accurately. We have produced a model that accurately predicts RRV infections throughout the year, in the Darwin region. Our model also indicates that predicted anthropogenic global climatic changes may result in an increase in RRV infections. Further research needs to target other high-risk areas elsewhere in tropical Australia to ascertain the best local climatic and vector predictive RRV infection models for each region. This methodology can also be tested for assessing utility of predictive models for other mosquito-borne diseases endemic to locations outside Australia.
doi_str_mv 10.1111/j.1365-3156.2008.02095.x
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international health</jtitle><addtitle>Trop Med Int Health</addtitle><date>2008-07</date><risdate>2008</risdate><volume>13</volume><issue>7</issue><spage>943</spage><epage>952</epage><pages>943-952</pages><issn>1360-2276</issn><eissn>1365-3156</eissn><abstract>To describe the epidemiology of Ross River virus (RRV) infection in the endemic Darwin region of tropical northern Australia and to develop a predictive model for RRV infections. Analysis of laboratory confirmed cases of RRV infection between 01 January 1991 and 30 June 2006, together with climate, tidal and mosquito data collected weekly over the study period from 11 trap sites around Darwin. The epidemiology was described, correlations with various lag times were performed, followed by Poisson modelling to determine the best main effects model to predict RRV infection. Ross River virus infection was reported equally in males and females in 1256 people over the 15.5 years. Average annual incidence was 113/100 000 people. Infections peaked in the 30-34 age-group for both sexes. Correlations revealed strong associations between monthly RRV infections and climatic variables and also each of the four implicated mosquito species populations. Three models were created to identify the best predictors of RRV infections for the Darwin area. The climate-only model included total rainfall, average daily minimum temperature and maximum tide. This model explained 44.3% deviance. Using vector-only variables, the best fit was obtained with average monthly trap numbers of Culex annulirostris, Aedes phaecasiatus, Aedes notoscriptus and Aedes vigilax. This model explained 59.5% deviance. The best global model included rainfall, minimum temperature and three mosquito species. This model explained 63.5% deviance, and predicted disease accurately. We have produced a model that accurately predicts RRV infections throughout the year, in the Darwin region. Our model also indicates that predicted anthropogenic global climatic changes may result in an increase in RRV infections. Further research needs to target other high-risk areas elsewhere in tropical Australia to ascertain the best local climatic and vector predictive RRV infection models for each region. This methodology can also be tested for assessing utility of predictive models for other mosquito-borne diseases endemic to locations outside Australia.</abstract><cop>Oxford, UK</cop><pub>Oxford, UK : Blackwell Publishing Ltd</pub><pmid>18482196</pmid><doi>10.1111/j.1365-3156.2008.02095.x</doi><tpages>10</tpages><oa>free_for_read</oa></addata></record>
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ispartof Tropical medicine & international health, 2008-07, Vol.13 (7), p.943-952
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subjects Adolescent
Adult
Aedes
Aged
Alphavirus Infections - epidemiology
Animals
arbovirus
Australia - epidemiology
Biological and medical sciences
cambio climático
changement climatique
Child
Child, Preschool
Climate
Climate change
Culex
Disease Vectors
enfermedades transmitidas por mosquitos
Epidemiology
epidemiología
Female
Forecasting - methods
Freshwater
General aspects
Humans
Incidence
Infections
maladies transmises par les moustiques
Male
Medical sciences
Middle Aged
mosquito-borne disease
Mosquitoes
Ross River virus
tropical
Tropical diseases
virus de la rivière Ross
virus de Ross River
Water Movements
épidémiologie
title Predictive indicators for Ross River virus infection in the Darwin area of tropical northern Australia, using long-term mosquito trapping data
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