Immunity to dengue is low in Singapore's population because of the intensive dengue-carrier controls, "making the population vulnerable to outbreaks, " said Ng Lee Ching, director of the Environmental Health Institute at Singapore's National Environment Agency.

WSJ: Dengue Fever on the Rise in Singapore

Some factors behind this year's outbreak include a higher mosquito population and "fitter viruses with higher epidemic potential, " said according to Ng Lee Ching, director of the Environmental Health Institute at Singapore's National Environment Agency.

WSJ: Dengue Fever on the Rise in Singapore

Ng, who is now an Asia-based managing director of Silicon Valley's Granite Global Ventures, says the venture capital firm expects to invest more money in China in the next few years.

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