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The Hajj Is a Perfect Laboratory for Disease Warning Systems

Anywhere there are massive crowds in limited space, disease is likely to spread—and so it has at the hajj, everything from minor respiratory infections to polio. This year, though, a layer of protection has been built into the pilgrimage that never existed before: an electronic early-warning system, created with the help of the World Health Organization, that will sound an alarm at the first signal of any kind of outbreak.

 

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