Around 2.5 billion people worldwide are at risk from dengue fever - a virus spread by mosquitos which causes excruciating headaches, muscle and joint pain. It is usually associated with the tropics of South East Asia and Africa, but as recently as 2009, there was a major outbreak in the Australian city of Cairns. At the city's James Cook University, a team led by Professor Scott Ritchie is working on a new strategy for tackling dengue.
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