Dengue Fever Risk Higher in Rural Areas Than Cities

by Thilaka Ravi on  August 31, 2011 at 10:18 AM Tropical Disease News
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Dengue Fever Risk Higher in Rural Areas Than Cities
In contrast to conventional thinking a recent study found that in dengue-endemic areas such as South-East Asia, rural areas rather than cities may bear the highest burden of dengue fever—a viral infection that causes sudden high fever, severe headache, and muscle and joint pains, and can lead to a life-threatening condition, dengue hemorrhagic fever.

The study led by Wolf-Peter Schmidt from the Nagasaki Institute of Tropical Medicine, Japan, and published in this week's PLoS Medicine, the authors analysed a population in Kanh-Hoa Province in south-central Vietnam (~350,000 people) that was affected by two dengue epidemics between January 2005 and June 2008.

They found that at low human population densities, mostly in rural areas, dengue risk is up to three times higher than in cities, presumably because the number of mosquitoes per individual is higher in low density areas.

The authors show that severe outbreaks of dengue occur almost exclusively in areas falling within a narrow range of human population densities with limited access to tap water, where water storage vessels provide breeding sites for the mosquitoes causing dengue fever. However, as the actual number of people who contract dengue fever in populated areas is high, urban areas still substantially contribute to dengue epidemics.

The authors argue that improving water supply and vector control in areas with a human population density critical for dengue transmission could increase the efficiency of control efforts.

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If you have a question about health related issues, you can now post it in our Ask An Expert section on our community website Medwonders.com and get answers from our panel of experts.

10/20/2011

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