his parents say what started as a sinus infection left him barely able to speak or move his arms and legs. >> i can't tell you how he feels and how he's hurting or anything, so, it's heartbreaking. >> reporter: camdyn is fighting acute flaccid myelitis, or afm, a rare illness with polio-like symptoms. after spikes in 2014 and 2016, the cdc says we could be seeing a similar outbreak. >> we're suggesting parents do the things they would normally do to prevent serious illness, like washing their hands, wearing bug repellant and making sure they're up to date on their vaccines. >> reporter: the cause of afm is unknown, but doctors say it could be linked to viruses. so far this year, 127 patients are under investigation. 62 are confirmed cases. the average age? 4 years old, like camdyn. david, this illness affects less than 1 in a million, but it's serious. so, the cdc is warning parents to look for any sudden signs of