Dengue is fastest-spreading tropical disease, World Health Organization says

Dengue is the world's fastest-spreading tropical disease and represents a "pandemic threat", infecting an estimated 50 million people across all continents, the World Health Organization (WHO) said on Wednesday. Transmitted by the bite of female mosquitoes, the disease is occurring more widely due to increased movement of people and goods - including carrier objects such as bamboo plants and used tyres - as well as floods linked to climate change, the United Nations agency said.

The viral disease, which affected only a handful of areas in the 1950s, is now present in more than 125 countries - significantly more than malaria, historically the most notorious mosquito-borne disease.

The most advanced vaccine against dengue is only 30 percent effective, trials last year showed. "In 2012, dengue ranked as the fastest spreading vector-borne viral disease with an epidemic potential in the world, registering a 30-fold increase in disease incidence over the past 50 years," the WHO said in a statement.

Late last year, Europe's suffered its first sustained outbreak since the 1920s, with 2,000 people infected on the Portuguese Atlantic island of Madeira. Worldwide, 2 million cases of dengue are reported each year by 100 countries, mainly in Asia, Africa and Latin America, causing 5,000 to 6,000 deaths, said Dr. Raman Velayudhan, a specialist at the WHO's control of neglected tropical diseases department.But the true number is far higher as the disease has spread exponentially and is now present on all continents, he said.

"The WHO estimates that on average about 50 million cases occur every year. This is a very conservative estimate," Velayudhan told Reuters, adding that some independent studies put the figure at 100 million."Dengue is the most threatening and fastest spreading mosquito-borne disease. It is pandemic-prone, but it is a threat only.Definitely a bigger threat now than ever," he saidMalaria caused more deaths but was on the decline, affecting fewer than 100 countries.

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