U.S. cases of a polio-like illness rise, but there are few clues to its cause
The CDC has confirmed 90 cases of acute flaccid myelitis out of 252 suspected cases
![Chase Kulakowski](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2018/11/111318_ac_afm-update_feat.jpg?fit=860%2C460&ssl=1)
STILL RECOVERING Chase Kulakowski, now aged 3, developed acute flaccid myelitis in October 2016. What started as a runny nose quickly progressed to a having lifeless right arm, the Chicago Tribune reported. But surgery and physical therapy has given Chase use of his arm again.
Armando L. Sanchez/Chicago Tribune/TNS via Getty Images