Enlarge / The Plaza Mayor or Plaza de Armas of Lima in Peru, part of a Unesco world heritage site in Lima. Getty | Frédéric Soltan/Corbis
Over 230 people in Peru have developed a rare, paralyzing neurological disorder called Guillain-Barré Syndrome, leading government officials to declare a national emergency and the World Health Organization to send out a disease outbreak alert.
So far, four people have died from the disorder, which involves the immune system attacking peripheral nerves. It often starts with progressive muscle weakness and numbness that can lead to paralysis and, in about a quarter of the cases,
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