A rare neurological condition that mostly affects children and mysteriously returns every two years is likely to flare up in the coming weeks and months, US health authorities warned Tuesday.

The US Centers for Disease Control and Prevention said that it “anticipates that 2020 will be another peak year for cases of acute flaccid myelitis (AFM).”

The disease, which is likely caused by a virus, can lead to permanent paralysis and life-threatening complications from respiratory failure, the CDC said.