23 Jul 2007 12:10:49 GMT
Source: Reuters

MANILA, July 23 (Reuters) - The World Health Organisation said on Monday
the Western Pacific region could be at risk from a major outbreak of
dengue unless governments improve efforts and cooperation to stamp out
the virus.

About 40 percent of the world's population are at risk from dengue, and
the mosquito-borne virus has spread rapidly across Southeast Asia this
year due to warmer weather, heavy rains and crowded cities.

"Factors leading to the spread of dengue include population explosion,
migration and rapid growth of urban areas, which place a heavy strain on
public health services and access to drinkable water," said John
Ehrenberg, a WHO regional adviser.

The virus, which is transmitted by the Aedes aegypti mosquito, causes
severe fever, headaches, rashes and muscle and joint pain. Severe forms
can cause haemorrhagic fever. There is no vaccine.

Dengue has killed hundreds in Southeast Asia and infected tens of
thousands this year but Ehrenberg warned that tracking outbreaks was
difficult because many incidences of the virus are not officially reported.

He called for countries in the region to increase dengue surveillance,
properly manage patients, reduce mosquito breeding sites and prepare for
outbreaks. Information-sharing was also key.

More than 50 million dengue infections, including about 400,000 cases of
dengue haemorrhagic fever, are estimated to occur annually around the globe.

Dengue haemorrhagic fever is a leading cause of childhood death in many
endemic countries, according to the WHO.

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