The fact that the real estate contagion has caused a severe infection of the entire US financial system is now finally being widely admitted by Wall Street.

房产市场的实际状况严重影响到全美经济系统已经得到华尔街的普遍认同。

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But Columbia University Professor Ian Lipkin, of the Mailman School of Public Health's Centre for Infection and Immunity, a scientific adviser on Contagion, is not convinced that crowdsourcing is an effective way to combat the spread of contagious diseases.

BBC: Can crowdsourcing beat the flu?