Dengue Outbreak in Year 2015

It is now year 2015, 10 years after the last Dengue outbreak in Singapore in 2005. There is once again a sudden outbreak of dengue fever in Singapore. Countries in the South East Asian region including Malaysia, Indonesia and Thailand have also reported sharp increases in the number of dengue cases.

Many people are falling ill and the hospitals are beginning to be filled up to the capacity with patients inflicted with dengue.

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Questions:
Why is there a sudden resurgence or outbreak of Dengue fever, 10 years after 2005?

What could have caused the spread of Dengue fever to countries as far as Thailand?

What are the immediate emergency measures that can be taken to stop the spread?