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Nevertheless, its spread is troubling because the virus can lead to a rare and debilitating neurological condition called acute flaccid myelitis, or AFM.

AFM attacks motor neurons in the spinal cord’s gray matter, which controls movement.

If the virus progresses to cause AFM, symptoms include:

This year, the CDC has confirmed 13 cases of AFM, including one in California, as of Sept. 3.

The paralysis caused by AFM is very similar to that caused by polio — which, like EV-D68, is also an enterovirus.