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. 2012 Jun 8;3(2):39-45.
doi: 10.5365/WPSAR.2011年2月3日.002. Print 2012 Apr.

Incidence of dengue virus infection among Japanese travellers, 2006 to 2010

Affiliations

Incidence of dengue virus infection among Japanese travellers, 2006 to 2010

Naomi Nakamura et al. Western Pac Surveill Response J. .

Abstract

Introduction: Dengue continues to be a global public health concern. In Japan, although dengue cases are currently seen only among travellers returning from endemic areas, the number of reported cases is rising according to the national case-based surveillance system. We evaluated the characteristics of dengue cases imported into Japan and the relationship between the incidence of infection and season of travel to popular destinations.

Methods: Dengue cases reported to the national surveillance system were retrospectively examined. The number of reported cases per number of Japanese travellers to a dengue-endemic country was calculated to estimate the country-specific incidence of imported dengue virus infection. The incidence of dengue infection among Japanese travellers was compared between dengue high season and low season in each country using relative risk (RR) and associated 95% confidence intervals (CI).

Results: Among 540 Japanese residents who were reported as dengue cases from 2006 to 2010, the majority had travelled to Indonesia, India, the Philippines and Thailand. The RR of dengue infection among Japanese travellers during dengue high season versus low season was 4.92 (95% CI: 3.01-8.04) for the Philippines, 2.76 (95% CI: 1.67-4.54) for Thailand and 0.37 (95% CI: 0.15-0.92) for Indonesia.

Discussion: Overall, higher incidence of imported cases appeared to be related to historic dengue high seasons. Travellers planning to visit dengue-endemic countries should be aware of historic dengue seasonality and the current dengue situation.

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Figures

Fig. 1
Fig. 1
Number of reported dengue cases by year and country visited, Japan, 2006–2010 (n = 540)
Fig. 2
Fig. 2
Number of reported dengue cases by aggregated month and country visited, Japan, 2006–2010 (n = 540)
Fig. 3
Fig. 3
Rate of reported dengue cases per 100 000 travellers by year and country visited, Japan, 2006–2010
Fig. 4
Fig. 4
Rate of reported dengue cases per 100 000 travellers by month and country visited,* Japan, 2006–2010

References

    1. Global Alert and Response. Impact of Dengue [Internet] Geneva: World Health Organization; 2011. http://www.who.int/csr/disease/dengue/impact/en accessed 17 July 2011.
    1. Hotta S. Dengue vector mosquitoes in Japan: The role of Aedes albopictus and Aedes aegypti in the 1942–1944 dengue epidemics of Japanese Main Islands. Medical Entomology and Zoology. 1998;49:267–74. [in Japanese]
    1. Hanna JN, Ritchie SA. An apparent recent decline in importations of dengue from Papua New Guinea into north Queensland. Communicable Diseases Intelligence Quarterly Reports. 2009;33:34–5. - PubMed
    1. Hanna JN, et al. Two contiguous outbreaks of dengue type 2 in north Queensland. The Medical Journal of Australia. 1998;168:221–5. - PubMed
    1. La Ruche G, et al. First two autochthonous dengue virus infections in metropolitan France, September 2010. Euro Surveillance: European Communicable Disease Bulletin. 2010;15(39):pii=19676. - PubMed

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