| Climate Variation and Incidence of Ross River Virus in Cairns, Australia: A Time-Series Analysis Shilu Tong and Wenbiao Hu Centre for Public Health Research, Queensland University of Technology, Kelvin Grove, Queensland, Australia Abstract
In this study we assessed the impact of climate variability on the Ross River virus (RRv) transmission and validated an epidemic-forecasting model in Cairns, Australia. Data on the RRv cases recorded between 1985 and 1996 were obtained from the Queensland Department of Health. Climate and population data were supplied by the Australian Bureau of Meteorology and the Australian Bureau of Statistics, respectively. The cross-correlation function (CCF) showed that maximum temperature in the current month and rainfall and relative humidity at a lag of 2 months were positively and significantly associated with the monthly incidence of RRv, whereas relative humidity at a lag of 5 months was inversely associated with the RRv transmission. We developed autoregressive integrated moving average (ARIMA) models on the data collected between 1985 to 1994, and then validated the models using the data collected between 1995 and 1996. The results show that the relative humidity at a lag of 5 months (p < 0.001) and the rainfall at a lag of 2 months (p < 0.05) appeared to play significant roles in the transmission of RRv disease in Cairns. Furthermore, the regressive forecast curves were consistent with the pattern of actual values. Key words: autoregressive integrated moving average, climate change, cross-correlation function, disease prediction, Ross River virus. Environ Health Perspect 109:1271-1273 (2001) . [Online 28 November 2001] http://ehpnet1.niehs.nih.gov/docs/2001/109p1271-1273tong/ abstract.html Address correspondence to S. Tong, Centre for Public Health Research, Queensland University of Technology, 149 Victoria Park Road, Kelvin Grove, Queensland, Australia. Telephone: 61-7-3864-5437. Fax: 61-7-3864-5941. E-mail: s.tong@qut.edu.au Received 20 March 2001 ; accepted 8 May 2001.
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