There have been 116 confirmed cases of a polio-like condition called acute flaccid myelitis (AFM) in the United States so far this year, the U.S. Centers for Disease Control and Prevention says.
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The cases have occurred in 31 states and most have involved children, NBC News reported Monday.
In its latest update, the CDC says it is investigating 286 cases of AFM, and still does not have a confirmed cause for the disease, which causes muscle weakness or paralysis due to spinal cord damage.
High on the list of suspects are enteroviruses, which typically cause nothing worse than the common cold, NBC News reported.
"Respiratory illnesses and fever from viral infections such as enteroviruses are common, especially in children, and most people recover. We don't know why a small number of patients develop AFM, while most others recover," the CDC said.
The agency noted that AFM cases in the United States rise and fall year to year, with 120 confirmed cases in 2014, 22 cases in 2015, 149 cases in 2016 and 33 cases in 2017, NBC News reported.
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