April 7th, 2013
01:05 PM ET
Study suggests new approach to dengue fever
Dengue fever may be more than three times more prevalent than current estimates, according to a new report.
The study, led by researchers at the University of Oxford in England, estimates there are 390 million dengue infections around the world each year. Currently, the World Health Organization puts the number between 50 and 100 million infections each year. Researchers hope their findings will help pinpoint parts of the world most vulnerable to dengue fever and develop strategies to treat it.
Dengue fever is passed from person to person by mosquitos. Unlike malaria, there are no drugs you can take to avoid getting it. It also is difficult to treat and thus far, attempts to develop a vaccine have been unsuccessful.
Map: Areas in red indicate high risk for dengue occurrence, while green areas indicate low risk.
It is most common in Asia and India, but more cases have been popping up in the Caribbean and Latin America in recent years. In mild cases, dengue fever causes a high fever, rash and joint and muscle pain. In extreme cases, it can cause death. According to the World Health Organization, about 12,000 people die of dengue fever each year. Many of them are children.
For this research, a team of international experts developed a statistical model based on things like temperature, humidity and even newspaper reports, to figure out where dengue was most likely to show up. Then, they combined that information to develop a map, down to precise 5-by-5 kilometer regions where outbreaks were most likely to occur.
"This helps us make a decision on where we prioritize efforts to reduce the burden of disease," says Tom Scott, a researcher at the University of California, Davis, and one of the authors of the report. By 2015, the WHO wants to reduce deaths from dengue fever by 50%.
"It's really doable," says Scott. "These maps could help direct that."
But some experts take issue with the study's numbers and say the estimate is too high.
"Dengue is extremely complicated," says Dr. Scott Halstead, who has been studying the disease for over 50 years and is the senior scientific advisor to the Dengue Vaccine initiative at the Bill & Melinda Gates Foundation.
He points out the numbers for Africa. "A disease resistance gene in Africa has been well established, which suggests the disease burden in Africa is overestimated," says Halstead.
The study is published in the current edition of the journal Nature.
About this blog
Get a behind-the-scenes look at the latest stories from CNN Chief Medical Correspondent, Dr. Sanjay Gupta, Senior Medical Correspondent Elizabeth Cohen and the CNN Medical Unit producers. They'll share news and views on health and medical trends - info that will help you take better care of yourself and the people you love.
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