Imported dengue cases, weather variation and autochthonous dengue incidence in Cairns, Australia

Huang, Xiaodong, Williams, Gail, Clements, Archie C. A. and Hu, Wenbiao (2013) Imported dengue cases, weather variation and autochthonous dengue incidence in Cairns, Australia. PLoS One, 8 12: e81887.1-e81887.7. doi:10.1371/journal.pone.0081887


Author Huang, Xiaodong
Williams, Gail
Clements, Archie C. A.
Hu, Wenbiao
Title Imported dengue cases, weather variation and autochthonous dengue incidence in Cairns, Australia
Journal name PLoS One   Check publisher's open access policy
ISSN 1932-6203
Publication date 2013-12
Sub-type Article (original research)
DOI 10.1371/journal.pone.0081887
Open Access Status DOI
Volume 8
Issue 12
Start page e81887.1
End page e81887.7
Total pages 7
Place of publication San Francisco, CA, United States
Publisher Public Library of Science
Collection year 2014
Language eng
Formatted abstract
Background: Dengue fever (DF) outbreaks often arise from imported DF cases in Cairns, Australia. Few studies have incorporated imported DF cases in the estimation of the relationship between weather variability and incidence of autochthonous DF. The study aimed to examine the impact of weather variability on autochthonous DF infection after accounting for imported DF cases and then to explore the possibility of developing an empirical forecast system.

Methodology/principal finds: Data on weather variables, notified DF cases (including those acquired locally and overseas), and population size in Cairns were supplied by the Australian Bureau of Meteorology, Queensland Health, and Australian Bureau of Statistics. A time-series negative-binomial hurdle model was used to assess the effects of imported DF cases and weather variability on autochthonous DF incidence. Our results showed that monthly autochthonous DF incidences were significantly associated with monthly imported DF cases (Relative Risk (RR):1.52; 95% confidence interval (CI): 1.01–2.28), monthly minimum temperature (oC) (RR: 2.28; 95% CI: 1.77–2.93), monthly relative humidity (%) (RR: 1.21; 95% CI: 1.06–1.37), monthly rainfall (mm) (RR: 0.50; 95% CI: 0.31–0.81) and monthly standard deviation of daily relative humidity (%) (RR: 1.27; 95% CI: 1.08–1.50). In the zero hurdle component, the occurrence of monthly autochthonous DF cases was significantly associated with monthly minimum temperature (Odds Ratio (OR): 1.64; 95% CI: 1.01–2.67).

Conclusions/significance: Our research suggested that incidences of monthly autochthonous DF were strongly positively associated with monthly imported DF cases, local minimum temperature and inter-month relative humidity variability in Cairns. Moreover, DF outbreak in Cairns was driven by imported DF cases only under favourable seasons and weather conditions in the study.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2014 Collection
School of Public Health Publications
 
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