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Alexandra Sifferlin

This color-coded image shows the surface view of enterovirus D68. Red regions are the highest peaks, and the lowest portions are blue. In the black-and-white background are actual electron microscopy images of the EV-D68 virus.

Why have some American kids been paralyzed for a year? Doctors are trying to find out.

Medicine

Last fall, a breakout of enterovirus left hundreds of kids with flu-like symptoms, but one group came down with something much worse: polio-like paralysis in the arms and legs. While the virus has stopped spreading, doctors are still puzzled by what caused the paralysis.