One case was reported earlier this year.
- Add the Keystone State to the list of places now dealing with a mysterious polio-like illness that can partially paralyze children.
The condition is still very rare, occurring in fewer than one in a million people in the US each year, the CDC says.
The CDC must review case information to confirm the cases under observation in Pittsburgh, a process which could take a few weeks, Scarpino said.
Symptoms of the disease include weakness in the arms or legs, difficulty swallowing, slurred speech and facial drooping.
Poliovirus and West Nile virus may sometimes lead to AFM.
39 kids in NY have had virus linked to polio-like illness
According to UH, AFM is a rare condition that attacks the nervous system, specifically the spinal cord, and can cause paralysis. Nine people who are all under the age of 18 and from northern IL have been diagnosed with Acute Flaccid Myelitis or AFM.
Five children under 6 have been hospitalized with a sudden limb paralysis that has local, state and national health officials investigating whether it's a serious but rare condition called AFM.
Health officials are warning parents to be on the lookout for symptoms.
AFM is diagnosed by examining a patient's nervous system in combination with reviewing pictures of the spinal cord.
The Colorado Department of Health says it has 14 confirmed cases this year, all of whom are children who needed hospitalization.
"At this point there isn't evidence that would point to a single source of illness among these cases", said Dr. Scott Lindquist, an infectious-disease epidemiologist at the Department of Health. Nationwide, 38 cases in 16 states have been reported and there is still no known cause. A 2016 report found there were 120 cases recorded across 34 states from August through December 2014.
"What we do know is that AFM can be caused by lots of different things, and one of those things is a viral infection", Dr. Meade said.
According to our Dallas sister station WFAA, three children in North Texas have also been confirmed to have AFM. "While we don't know if it is effective in preventing AFM, washing your hands often with soap and water is one of the best ways to avoid getting sick and spreading germs to other people".