Prevention includes polio vaccination and avoiding mosquito bites.[1] Treatment involves supportive care.[5][2] Physical therapy may be recommended.[3] Occasionally, mechanical ventilation is required to support breathing.[3] Outcomes are variable.[5] The condition is rare and occurs most commonly in children.[3] Fewer than one in 500,000 children is affected per year in the United States.[3] Although the illness is not new, an increase in cases has been seen since 2014 in the United States.[3] In 2018, 233 cases were confirmed in the United States.[7]