Although there's now no vaccine or treatment, says Hallberg, there are very few cases of AFM. On its website, the CDC explains that non-polio enteroviruses, which normally don't make people sick and if they do, it's often the common cold, can cause AFM.
All of the patients are "from northern IL", according to the health department, but no other location information was provided.
"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.
The rare, poorly understood, polio-like illness is thought to attack the body's nervous system - specifically, the spinal cord - and can cause paralysis.
It can cause a sudden onset of weakness or paralysis in the arms or legs, as well as loss of muscle tone and reflexes. So far this year, there have been 38 cases in 16 states, the CDC says.
AFM is not a reportable disease, meaning there may be more cases that were just treated and the child recovered and AFM wasn't diagnosed. The CDC has been monitoring the condition more closely since 2014, when there was a nationwide spike in cases. It existent with contained limb is the weakness of unknown cause.
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There is no treatment other than managing each patient's symptoms.
"The CDC has indicated there might be some increases in cases, and in mid-September we advised health care providers to be vigilant and report to the health department so that we can pass on the information to the CDC", Arnold said.
"The patients are now undergoing diagnostic procedures and treatment", said Andrea Kunicky, a spokeswoman for UPMC Children's Hospital of Pittsburgh, where the children are being treated.
Experts say you should take your child to the hospital right away if he or she develops AFM symptoms like limb weakness, facial drooping, and trouble swallowing or speaking.
The condition is still very rare, occurring in fewer than one in a million people in the US each year, the CDC says.