A contractor fumigates a garden area to help prevent the breeding of Aedes mosquitoes at a residential estate in Singapore in this August 23, 2007 file photo. Rapid urbanisation has helped to fuel the spread of dengue fever to more than 100 countries, as the mosquitoes which carry the disease find fertile breeding grounds in cities. Picture taken August 23, 2007. To match feature DENGUE/ REUTERS/Vivek Prakash (SINGAPORE)
REUTERS/VIVEK PRAKASH