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Modern communication networks, such as cell phone systems and the Internet, have provided researchers with the opportunity to study human associations and movement on a much greater scale than previously possible. Almost all of the papers that describe this sort of network analysis notes that it could have real world applications, since existing and emerging disease threats can spread through social and transit networks. A paper that will be released later this week by PNAS. , however, skips the whole "this may be a useful model" aspect, and goes straight to a network in which diseases actually do spread: prostitutes and their clients. Although organized prostitution is apparently illegal in Brazil, there are no laws against receiving payment for sex, making it possible for sex workers to freelance. Like everything else these days, that trade has found its way onto the Internet, and some enterprising Brazilians created an ad-supported public forum for individuals on both

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