In January, Colombia saw an unusual increase in cases of Guillain-Barre Syndrome, a rare disorder where a person's immune system attacks the nervous system, in some cases temporarily paralyzing the body and requiring hospitalization.

As in neighboring Brazil and Venezuela, the uptick in Colombia happened at the same time as a local Zika outbreak, leading experts to begin searching for a connection. Researchers have since rushed to find out more, and a new report publishedWednesday in the New England Journal of Medicine outlines the most compelling evidence to date linking the mosquito-borne virus to the debilitating disorder.

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