While the world quivers over a potential Swine Flu pandemic, a far deadlier outbreak of dengue fever has gone comparatively under-reported in South America and Australia.

Hundreds of thousands have been infected in South America, and in Australia the outbreak is being called the worst seen in 50 years. While the swine flu scare may be an overreaction in comparison, both outbreaks do highlight a clear link between environmental degradation and the spread of disease.