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Geographical gradient of mean age of dengue haemorrhagic fever patients in northern Thailand

  • Y. NAGAO (a1), A. TAWATSIN (a2), S. THAMMAPALO (a3) and U. THAVARA (a2)
Abstract
SUMMARY

Dengue haemorrhagic fever (DHF) is caused by dengue virus transmitted by Aedes mosquitoes; mean age of patients varies temporally and geographically. Variability in age of patients may be due to differences in transmission intensity or demographic structure. To compare these two hypotheses, the mean age of DHF patients from 90 districts in northern Thailand (1994–1996, 2002–2004) was regressed against (i) Aedes abundance or (ii) demographic variables (birthrate, average age) of the district. We also developed software to quantify direction and strength of geographical gradients of these variables. We found that, after adjusting for socioeconomics, climate, spatial autocorrelation, the mean age of patients was correlated only with Aedes abundance. The geographical gradient of mean age of patients originated from entomological, climate, and socioeconomic gradients. Vector abundance was a stronger determinant of mean age of patients than demographic variables, in northern Thailand.

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Copyright
The online version of this article is published within an Open Access environment subject to the conditions of the Creative Commons Attribution-NonCommercial-ShareAlike licence <http://creativecommons.org/licenses/by-nc-sa/2.5/>. The written permission of Cambridge University Press must be obtained for commercial re-use.
Corresponding author
*Author for correspondence: Dr Y. Nagao, Yao Tokushukai General Hospital, Osaka, 581-0011Japan. (Email: in_the_pacific214@yahoo.co.jp)
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Epidemiology & Infection
  • ISSN: 0950-2688
  • EISSN: 1469-4409
  • URL: /core/journals/epidemiology-and-infection
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Keywords:

Type Description Title
UNKNOWN
Supplementary Figure 3 - R0 over mean age

Nagao Supplementary Figure 3
Nagao Supplementary Figure 3 - R0 over mean age

 Unknown (721 KB)
721 KB
UNKNOWN
Supplementary Figure 4 - Polar Coordinate

Nagao Supplementary Figure 4
Nagao Supplementary Figure 4 - Polar Coordinate

 Unknown (619 KB)
619 KB
UNKNOWN
Supplementary Figure 2 - Regression Plots

Nagao Supplementary Figure 2
Nagao Supplementary Figure 2 - Regression Plots

 Unknown (865 KB)
865 KB
WORD
Supplementary Materials

Nagao Supplementary Material
Nagao Supplementary Material

 Word (29 KB)
29 KB
UNKNOWN
Supplementary Figure 1 - Histograms

Nagao Supplementary Figure 1
Nagao Supplementary Figure 1 - Histograms

 Unknown (948 KB)
948 KB

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