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Researh Service


Acute Flaccid Myelitis: How CDC Assists

States in Investigating Emerging Diseases



Updated November 14, 2018
Concern has grown over the recent increase in Acute Flaccid Myelitis (AFM) cases around the country.
According to the Centers for Disease Control and Prevention (CDC), AFM is a rare condition with no
specific treatment that mostly impacts children. AFM affects a person's nervous system, particularly the
gray matter of the spinal cord, causing weakness in the arms and legs along with other symptoms. Media
reports often refer to AFM as a polio-like condition because its symptoms mirror those associated with
poliovirus infection. To date, all AFM cases have tested negative for poliovirus, and no single pathogen
(germ) has been consistently detected in the patients' spinal fluid. Some tests have detected enteroviruses
or rhinoviruses, but no one virus type can explain all the cases.
As of November 9, CDC has confirmed 90 cases of AFM in 27 states thus far in 2018. CDC began
tracking AFM in August 2014, when there was a sudden increase in cases in the United States. As shown
in Figure 1, AFM cases have risen in late summer/early fall of 2014, 2016, and now in 2018. Though
cases have increased, AFM remains a rare disease. CDC estimates that fewer than one to two in a million
children in the United States get AFM each year.


















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