Concerns regarding acute flaccid myelitis (AFM), a debilitating disease, are growing due to the spread of EV-D68, an unusual respiratory virus. Severe paralysis happens on rare occasions, but most cases are moderate.

Scientists have found evidence that levels of enterovirus D68, which can cause a rare, polio-like condition in kids, has been spiking nationally since August.

D68, a seasonal virus that can -- in rare cases -- cause polio-like symptoms in children. Dr. Kristin Moffitt, an infectious disease specialist at Boston Children's Hospital, explains.