With the Zika virus spreading north into the United States, Alessandro Vespignani of Northeastern University pulled together some important information he wanted to share.

Mr. Vespignani, a professor computer sciences, led a research team that created the first model of the global spread of Zika based on the travel patterns of individual people.

In the hands of policy makers such as the U.S. Centers for Disease Control and Prevention, the model could give health experts critical guidance on what to tell the public and where to deploy medical resources at a time of widespread anxiety and uncertainty.

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