![Illustration - bird's eye view of an urban street and two people talking about the global scale of contagion.](/sites/default/files/styles/thumbnail/public/contagious-cities-promo1.jpg?itok=acVJt1Bt)
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Dale Crosby Close/Wellcome. CC-BY-NC
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![Illustration - bird's eye view of an urban street and two people talking about the global scale of contagion.](/sites/default/files/contagious-cities-promo1.jpg)
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