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Climate variations and bacillary dysentery in northern and southern cities of China.pdf

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Climate variations and bacillary dysentery in northern and southern cities of China

/journals/jinf Journal of Infection (2007) 55, 194e200Climate variations and bacillary dysentery in northern and southern cities of China Ying Zhang a, Peng Bi a,*, Janet E. Hiller a, Yuwei Sun b, Philip Ryan a a Department of Public Health, University of Adelaide, Level 9, 10 Pulteney Street, Adelaide, SA5005, Australia b Baoan Bureau of Health, Shenzhen, China Accepted 6 December 2006 Available online 26 January 2007 KEYWORDS Bacillary dysentery; Climate; Temperate; Subtropical; SARIMA Summary Objectives: This paper was aimed at examining the relationship between meteo- rological variables and bacillary dysentery in different climatic and geographic areas in China. Methods: Jinan in northern China, with a temperate climate, and Baoan in southern China, with a subtropical climate were chosen as study areas. Spearman correlations and seasonal Autoregressive Integrated Moving Average (SARIMA) models were used to quantify the associ- ation between meteorological variables and dysentery. The Hockey Stick model was used to explore the threshold of the effect of temperatures. Results: Maximum temperature, minimum temperature, rainfall, relative humidity and air pressure were significantly correlated with the incidence of dysentery in the both cities, with lag effects varying from zero to two months. In the SARIMA models, maximum and minimum temperatures were significantly associated with dysentery transmission. The thresholds for the effects of maximum and minimum temperatures were 17 C and 8 C, respectively, in the northern city. No thresholds were detected in the southern city. Conclusions: Climate variations have different impacts on the transmission of bacillary dysen- tery in temperate and subtropical cities in China. Public health action should be taken at this stage to reduce future risks of climate change with consideration of local climatic conditions. a 2006 Published by Elsevier Ltd on behalf of The British Infection Society.Introduction Bacillary dysentery,